Passed Exam Today AIF-C01

Precision is the metric that measures the proportion of true positives (actual frauds) among all flagged positives (flagged frauds). High precision ensures that most of the flagged cases are truly fraudulent, minimizing the number of false positives employees must review.

C is correct:

"Precision is the ratio of true positives to all predicted positives, and it answers: ‘Of all the cases flagged as fraud, how many were actually fraud?’ High precision means fewer non-fraudulent cases are sent for manual review."

(Reference: AWS ML Concepts – Precision and Recall, AWS Certified AI Practitioner Study Guide)

A (Recall) measures how many actual frauds are caught, but does not minimize false positives.

B (Accuracy) can be misleading in imbalanced datasets (like fraud detection).

The correct answer is Amazon Bedrock, AWS’s fully managed service for building and scaling generative AI applications using foundation models (FMs). Bedrock gives developers access to models from leading providers such as Anthropic (Claude), Meta (Llama), Mistral, Cohere, and Amazon Titan. Users can invoke these models via API without managing infrastructure or model training. According to AWS documentation, Bedrock supports tasks such as text generation, summarization, question answering, image generation, and RAG workflows with minimal setup. It supports both on-demand and provisioned throughput modes and integrates with features like Guardrails, Knowledge Bases, and Agents for secure, enterprise-grade applications. Amazon Q Developer is a generative AI tool for developers, but it doesn’t host or scale models. Amazon Kendra is an intelligent search engine, and Amazon Comprehend is used for NLP tasks like entity extraction—not foundation model access.

Referenced AWS AI/ML Documents and Study Guides:

Amazon Bedrock Developer Guide – Foundation Models and Use Cases

AWS Certified ML Specialty Guide – Generative AI on AWS

Amazon Bedrock Agents provide the capability to automate repetitive tasks and orchestrate complex workflows using generative AI models. This is particularly beneficial for customer support inquiries, where quick and efficient processing is crucial.

Option B (Correct): "Automation of repetitive tasks and orchestration of complex workflows": This is the correct answer because Bedrock Agents can automate common customer service tasks and streamline complex processes, improving response times and efficiency.

Option A: "Generation of custom foundation models (FMs) to predict customer needs" is incorrect as Bedrock agents do not create custom models.

Option C: "Automatically calling multiple foundation models (FMs) and consolidating the results" is incorrect because Bedrock agents focus on task automation rather than combining model outputs.

Option D: "Selecting the foundation model (FM) based on predefined criteria and metrics" is incorrect as Bedrock agents are not designed for selecting models.

AWS AI Practitioner References:

Amazon Bedrock Documentation: AWS explains that Bedrock Agents automate tasks and manage complex workflows, making them ideal for customer support automation.

The correct answer is D because Amazon OpenSearch Service supports k-Nearest Neighbor (k-NN) search and vector similarity search, which are required for semantic search tasks, such as matching natural language queries to image embeddings.

From AWS documentation:

"Amazon OpenSearch Service supports k-NN search, which allows you to run efficient similarity searches on large-scale datasets using vector embeddings generated by models. This enables applications like natural language-based image search and personalized recommendations."

In this use case, image data can be encoded into vectors using foundation models (e.g., via Amazon Bedrock or SageMaker), and OpenSearch Service can index and retrieve results based on vector similarity.

Explanation of other options:

A. Amazon Comprehend is for text-based NLP tasks and does not provide vector similarity or search functionality.

B. Amazon Personalize is for user-item recommendations and personalization, not vector-based semantic search.

C. Amazon Polly is a text-to-speech service and not related to image search or vector databases.

Referenced AWS AI/ML Documents and Study Guides:

Amazon OpenSearch Service Documentation – k-NN and Vector Search

AWS ML Specialty Study Guide – Semantic Search and Vector Indexing

AWS Generative AI Best Practices – Embeddings and Vector Databases