Your organization has a large corpus of legal documents stored in Azure Blob Storage. You need to build a solution that allows lawyers to ask natural language questions and get answers directly from the documents, without moving data out of Azure. Which service should you use?
Azure AI Search with semantic search reranks results using language understanding models, returning relevant passages from indexed legal documents. It satisfies the requirement to answer natural-language questions directly from documents while keeping data within Azure.
Why this answer
Azure AI Search with semantic search is the correct choice because it allows you to index legal documents stored in Azure Blob Storage, then query them using natural language questions. The semantic search capability re-ranks results based on contextual understanding, enabling the system to extract precise answers from the document corpus without moving data out of Azure.
Exam trap
The trap here is that candidates often confuse Azure AI Document Intelligence (which extracts structured data from forms) with a search-based Q&A solution, failing to recognize that Azure AI Search with semantic search is the correct service for querying unstructured text corpora with natural language.
How to eliminate wrong answers
Option A is wrong because Azure AI Document Intelligence is designed for extracting structured data (e.g., key-value pairs, tables) from scanned documents, not for answering natural language questions across a large corpus. Option C is wrong because Azure AI Language Service with custom question answering requires a predefined FAQ or QnA pair structure and does not natively index and search unstructured document content like legal documents. Option D is wrong because Azure AI Computer Vision is focused on image analysis and optical character recognition (OCR), not on text-based question answering or semantic search.