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If f(x)={x, when x is rational and 0, wh...

If `f(x)={x,` when `x` is rational and `0,` when `x` is irrational `g(x)={0,` when `x` is rational and `x,` when `x` is irrational then `(f-g)` is

A. one-one and into
B. neither one-one nor onto
C. many one and onto
D. one-one and onto

A

one-one and onto

B

neither one-one nor onto

C

many one and onto

D

one-one and onto

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