Answer:
Either, but if you need to pick one it would be noun.
Explanation:
The predicate nominative (or predicate noun) is the noun or pronoun that comes after a linking verb. It renames the subject of the sentence. The sentence should still make sense if you switch the predicate nominative and the subject.
Answer:
4 staff members
Explanation:
It mentions there are no staff numbers in a company. Hence, this means the number of staff members is equal to zero.
Now, four of them are added.
Hence, the remaining would be :
⇒ 0 + 4
⇒ 4 staff members