Which two Data Guard features require the use of flashback database by the broker? (Choose two.)

You must design an Oracle Data Guard configuration for an OLTP database that meets these permanent requirements:

1. Data loss is not permitted.

2. Read-only applications should not connect to the primary database instance.

Additionally, there are these requirements, only one of which is ever done at any one time:

1. It should be possible to apply designated patches with a minimum amount of downtime.

2. Upgrading to a new database release should be performed with the least possible amount of downtime.

3. New application software releases should be tested against an exact and up-to-date replica of the primary database.

Which configuration meets these requirements with the fewest databases?

You must configure an Oracle Data Guard environment consisting of:

1. A primary database

2. Three Physical Standby Databases

You must meet these requirements:

1. A designated physical standby database should become the primary database automatically whenever the primary database fails.

2. The chosen protection mode should provide the highest level of protection possible without violating the other requirement.

Which redo transport mode and protection mode would you configure to meet these requirements?