Question

according to the domain name system (dns), which of the following is a subdomain of the domain example.com? a about.example.com b example.co.uk c example.com.org d example.org

Explanation:

A sub - domain is a part of a larger domain. In the domain name system, a sub - domain appears to the left of the main domain name. For the domain example.com, about.example.com is a sub - domain as it has a prefix 'about' before the main domain name. The other options have different top - level domains (co.uk, org) or are different domains entirely.

Answer:

A. about.example.com