.com, .org and .net are popular as

ATop-level domains ✓ Correct

BTax-level domains

CTerrific-level domains

DNone of the above

Correct answer: (A) Top-level domains

Explanation

The endings .com, .org and .net are top-level domains, the last labels in a domain name.

Tax-level domains is not a real category of domain names.

Terrific-level domains is a meaningless distractor.

No other choice fits because these are genuine top-level domains.

A top-level domain sits at the highest position in the domain name hierarchy.

Country codes like .in and .uk are another class of top-level domains.

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