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

If the functions `f(x)a n dg(x)` are defined on `R rarr R` such that `f(x)={0, x in r a t ion a l x ,x in i r r a t ion a l` `a n dg(x)={O , x in i r r a t ion a l x ,x in r a t ion a l` 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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