Answer:
D. top-level domains is the correct answer.
Explanation:
Terms that identify the type of web resource such as .com, .edu, and .org are called top-level domains.
The top-level domain is also called domain name extension and it is the combination of the characters that end the web address.
Top-level domains help as an immediate way to know the website is regarding what and where it is associated.
Top-level domains are the most crucial in a hierarchy structure of website addresses.
In the website address, the alphabets at the end are called its top-level domain and .com is the most popular top-level domain.
