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Slack's current architecture guidance explicitly favors HTTP Request URLs for production applications when Socket Mode is not required. WebSockets are stateful, which makes them more complex to scale horizontally and more susceptible to connection interruptions, network partitions, and transient disconnections. Slack describes Socket Mode as particularly convenient for local development, on-premises integrations, environments behind firewalls, or applications unable to receive inbound HTTP traffic. For maximum application-connectivity reliability, Slack recommends HTTP for production applications and advises developers to continue using HTTP request URLs when their deployment does not specifically require Socket Mode. Socket Mode also does not replace the Web API; applications commonly receive events over Socket Mode and then invoke Web API methods to perform actions. Therefore, B accurately reflects Slack's present production-scale guidance.

Application governance in an Enterprise Slack organization is performed through administrative roles rather than ordinary channel members or application developers. Slack currently allows Org Owners, Org Admins, and appropriate administrative roles to view and manage applications at the organization level. Organization administrators can approve or restrict applications and establish policies that affect workspaces throughout the organization. At the workspace level, Workspace Owners and designated app managers can review requests and manage applications within the authority allowed by organization-wide policies. Slack support does not perform routine customer app approvals, and the original application developer does not control whether another organization's administrators permit installation. Although current Slack role models are more granular than the wording of the question, option B correctly represents the responsible administrative groups.

A distributed Slack app uses the OAuth 2.0 authorization-code flow to obtain authorization for each installation. The process begins by redirecting the installing user to Slack's authorization endpoint: The authorization request contains the application's Client ID together with the permissions being requested. Bot scopes are supplied using the scope parameter, while user scopes can be supplied through user_scope. The application's Client Secret must not be exposed in the browser-facing authorization request. After the user approves installation, Slack sends a temporary authorization code to the application's configured redirect URI. The backend then securely combines that temporary code with the application's client credentials when calling oauth.v2.access to exchange the code for access credentials. This distinction invalidates A and B because oauth.v2.access is the backend token-exchange API endpoint, not the user-facing authorization endpoint. D is incorrect because it would expose the Client Secret in a user redirect, violating OAuth security architecture. This question maps directly to Distribute Your App, particularly multi-workspace distribution, OAuth installation flows, requested scopes, and secure handling of Slack application credentials.

Slack locale information is explicitly opt-in at the API-request level. For a conversation, an application can call conversations.info and set include_locale=true. For an individual member, it can call users.info with the same parameter. Slack then includes the applicable locale field in the returned object. The locale is represented using an IETF language identifier such as en-US or another supported language-region combination. Slack's design guidance recommends using a conversation's locale for content published publicly within that conversation and using the individual user's locale for private or personalized interactions. Option C is incorrect because locale is not included automatically by default. The application must explicitly request it. Option A incorrectly treats locale retrieval as an app-dashboard configuration toggle rather than a Web API argument. Option D refers to API methods that do not exist; Slack uses established methods such as users.info and conversations.info. Applications should also retrieve current locale information when preparing content rather than permanently assuming a user's language preference, because those preferences may change. This directly aligns with Design a Great User Experience, particularly internationalization and localization of Slack application content.