Explanation:

This question evaluates understanding of the different Azure AI Computer Vision services and their distinct functionalities, as covered in the Microsoft AI-900 study guide and Microsoft Learn modules under "Describe features of common AI workloads" and "Identify Azure services for computer vision."
* Azure AI Document Intelligence (formerly known as Form Recognizer):This service is designed to extract structured information from documents, such as forms, receipts, and invoices. It uses optical character recognition (OCR) combined with AI models to detect key-value pairs, tables, and handwritten text. This makes it ideal for automating data entry and digitizing scanned documents.
Hence, it matches "Extract information from scanned forms and invoices."
* Azure AI Vision (formerly Computer Vision):This service provides image and video analysis capabilities. It can detect objects, people, text, and scenes; generate image captions; and extract descriptive tags. It also supports OCR for printed and handwritten text within images. Therefore, it matches "Analyze images and video, and extract descriptions, tags, objects, and text."
* Azure AI Custom Vision:Custom Vision allows you to train your own image classification and object detection models using your own labeled images. Unlike the general Vision service, Custom Vision lets you build domain-specific models-for example, detecting your company's products or identifying manufacturing defects. Hence, it matches "Train custom image classification and object detection models by using your own images." These three services complement each other within Azure's computer vision ecosystem, collectively supporting both general-purpose and specialized AI solutions for visual data analysis.