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If f(x) = {(x, if \x \ is \rational),(0...

If ` f(x) = {(x, if \x \ is \rational),(0,if \ x \ is \ irrational):} g(x) = {(0, if \x \ is \rational),(x,if \ x \ is \irrational):}` then ` f-g` is

A

1)one-one and into

B

2)neither one-one nor onto

C

3)many one and onto

D

4)one-one and onto

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The correct Answer is:
D
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