'Let the function `f: R-{-b}-R-{1}` be defined by `f(x)=(x+a)/(x+b)` , `a!=b` , then `f` is

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"Let the function `f: R-{-b}-R-{1}`
be defined by `f(x)=(x+a)/(x+b)`
, `a!=b`
, then
`f`
is one-one but not onto (b) `f`
is onto but not one-one
(c) `f`
is both one-one and onto (d) none of these"
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