Answer is correct:
As per https://learn.microsoft.com/en-us/azure/azure-video-indexer/customize-language-model-with-website
This step creates the model and gives the option to upload text files to the model.
TXT because Azure AI Video Indexer supports uploading custom vocabulary files in plain text format for training language models to recognize industry-specific terms. This format is simple and widely used for such purposes.
B is the answer
Upload text file(s) to train the language model. The file can either contain a list of words as you would like them to appear in the Video Indexer transcript or the relevant words included naturally in sentences and paragraphs. As better results are achieved with the latter approach, it's recommended for the upload file to contain full sentences or paragraphs related to your content.
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