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If the functions f(x)a n dg(x) are defin...

If the functions `f(x)a n dg(x)` are defined on `R rarr R` such that `f(x)={(0, x in rational) (x ,x in irrational)` `and g(x)={(O, x in irrational x), (x in rational)` then `(f-g)(x)i s`
(a)one-one and onto
(b)neither one-one nor onto
(c)one-one but not onto
(d)onto but not one-one

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