Which service should you use for real-time video analysis and object detection?

Correct answer: Amazon Rekognition

Amazon Rekognition is AWS's managed computer vision service that provides real-time video and image analysis capabilities including object and scene detection, facial analysis, activity recognition, and content moderation. Option C is correct because Rekognition is specifically built for visual analysis of both images and streaming video. Option A, Amazon Polly, is a text-to-speech service that converts text into lifelike speech and has no video analysis capability. Option B, Amazon Translate, is a neural machine translation service for converting text between languages, unrelated to visual content analysis. Option D, Amazon Textract, uses machine learning to extract text and structured data from scanned documents and images, but its focus is document text extraction rather than real-time object detection in video streams.