TeX is a third-generation programming language used for high-level computation & software sketching — would put it under "Technology & Programming"

Based on the given information, I can see that the title "Telegram" is a software application that enables instant messaging on phones and computers. Based on this, I would categorize it under "Technology & Programming".

Software/Technical Support agent... No, it seems that's not an option. How about: Title: POC Chat. Technology. Therefore, the answer is: Technology & Programming

Software doesn't seem to be on the list.

Communication and Messaging (correspondingly would be slightly adjusted as) Social Software is related to use of messaging app which is Very close to one of the categories listed below. Technology & Programming however best fits.

Technology & Programming This entity's title is "system", which suggests it relates to computers or software, indicating a connection to the field of Technology & Programming.

Computer Software (Technology & Programming) or Technology & Programming.

IT & Software

Software is not specified, but this does require evaluation of provided information to specifically match with options so based on the title "Telegram", the most fitting category is: Technology & Programming

IT teaches software engineering through practice, and has studies cases of decompiling, so I would categorize Telegram as "Technology & Programming".

Information technology, software engineering, or simply 'Technology'

Software not listed. Let me try another approach. Programming Challenges & Hackathons isn't listed directly, but Hackathons may be listed here. I assume you want technology. Here it is: Technology & Programming