You are building a knowledge base by using QnA Maker. Which file format can you use to populate the knowledge base? 

Answer options:

A. PPTX
B. XML
C. ZIP
D. PDF

D

D: Content types of documents you can add to a knowledge base: Content types include many standard structured documents such as PDF, DOC, and TXT. Note: The tool supports the following file formats for ingestion: ✑ .tsv: QnA contained in the format Question(tab)Answer. ✑ .txt, .docx, .pdf: QnA contained as regular FAQ content--that is, a sequence of questions and answers. Incorrect Answers: A: PPTX is the default presentation file format for new PowerPoint presentations. B: It is not possible to ingest xml file directly. Reference: https://docs.microsoft.com/en-us/azure/cognitive-services/qnamaker/concepts/data-sources-and-content