question_answer

If for two functions g and f, gof is both injective and surjective, then which of the following is true  [Kurukshetra CEE 1998]

A)            g and f should be injective and surjective

B)            g should be injective and surjective

C)            f should be injective and surjective

D)            None of them may be surjective and injective