Concept:A domain name in a URL gives clues about the country and the type of organisation that owns the website.
Explanation:The given web address is www.exams.edu.ng.
The labels in the domain name are separated by dots.
Reading from the right, .ng is the country-code top-level domain for Nigeria.
The label .edu is used in Nigeria for education-related bodies and accredited learning institutions.
The prefix exams shows that the site is connected with conducting or managing examinations.
Therefore, the whole URL points to an examination body that operates in Nigeria.
Niger, on the other hand, uses the country code .ne, not .ng, so options C and D are wrong.
Option B talks about a learning institution such as a school or college, but the keyword exams directly points to an organisation that carries out examinations.
Hence, the best description is an examination body.
Answer:A. an examination body.