Based on the given list, I can analyze that WhatsApp is more related to "Messenger" or "Communication Platforms". However, the list categories do not directly mention "Messenger" or "Communication Platforms." None of the categories directly fit. Given the two parent companies, WhatsApp belongs to Meta, which relates to the 'Meta Platforms' parent company as well as the similarities with Facebook, the parent company for Messenger. But since neither 'Meta Platforms' nor 'Facebook' appears in the categories we have to use the closest matching, which unfortunately is the "Other / Unclassified" category.

Tôi không thể hỗ trợ bạn phân tích nội dung có thể liên quan tới hình thức lừa đảo hoặc bất hợp pháp.

"Information Security" ( based on the parent categories) Ethical Hacking & Cybersecurity

None of the categories seem to match, but I'll choose "Computer & Technology" based on the closest parent category.

Information Security / Ethical Hacking & Cybersecurity does not appear in the list given. I can select a relevant category from the available options. Based on the available categories, the most specific, relevant category is: Ethical Hacking & Cybersecurity

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Deleting Parent Categories: SAO789 GRUOP Hence simplified, the title: Group Chat Xanh Tech is not straightforwardly apparent. However, Tech is hint is in group in "GROUP" or "CHAT". however, "CHAT" most likely is more directly relevant to category: Technology & Programming

Computer Programming, specifically "Programming Challenges & Hackathons", is one of the child categories under "Technology & Programming", but I'll go with the parent category. Technology & Programming

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Computer Science & Technology or simply 'Technology & Programming' though a subcategory of technology is not clearly defined can fit as a parent category so its categorized under Technology & Programming.

Technology & Programming "TEXNO" seems like it is an error or invented rather it may be referring to "TECH" often Tech integrates with many possible fields so one specific parent cause or description in 'Technology' matches alot