Answer :
The correct answer is: C. about.example.com. In a domain name, subdomains are indicated by the text that appears to the left of the main domain name.
According to the domain name system (DNS), a subdomain is a domain that is a part of a larger domain. In this case, about.example.com is a subdomain of the domain example.com because it is directly attached to the primary domain, example.com. The other options are either separate top-level domains (example.org, example.co.uk) or improperly formatted domain names (example.com.org).
In this case, the main domain name is example.com. The subdomain in option C is "about", making it a subdomain of example.com. Options A, B, and D are not subdomains of example.com as they have different main domain names.
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