test series question

Question

Which one of the following is not correct?

 (a) Application layer protocols are used by both source and destination devices during a communication session

 (b) Application layer protocols implemented on the source and destination host must match

 (c) Both (a) and (b)

(d) None of the mention

Answer 1

d) none of the mentioned

both source and destinatin need to use application layer and it needs to match