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Let f= {(1, 5), (2, 6), (3, 4)} g = {(4,...

Let f= {(1, 5), (2, 6), (3, 4)} g = {(4, 7), (5,8), (6,9)}. Then gof is :

A

{(4,7),(5,8),(6,9), (1, 5), (2, 6), (3, 4)}

B

{ }

C

{(1,8),(2,9),(3,7)}

D

None of these.

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