The suggested answer is D.
Azure Video Indexer is a cloud application built on Azure Media Analytics, Azure Search, Cognitive Services (such as the Face API, Microsoft Translator, the
Computer Vision API, and Custom Speech Service). It enables you to extract the insights from your videos using Video Indexer models described below:
✑ Closed captioning: Creates closed captioning in three formats: VTT, TTML, SRT.
✑ Celebrity identification: Video Indexer automatically identifies over 1 million celebrities "" such as world leaders, actors and actresses, athletes, researchers, business and tech leaders across the globe. The data about these celebrities can also be found on various famous websites, for example, IMDB and
Wikipedia.
References:
https://docs.microsoft.com/en-us/azure/media-services/video-indexer/video-indexer-overview