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Let f(x): D to R be defined as f(x)=(x^2...

Let `f(x): D to R` be defined as `f(x)=(x^2+2x+a)/(x ,^2+4x+3a),w h e r e' D '` is domain of `f(x)`. `f(x)` is a subjective function if
[a]`1lt=alt=2`
[b]`0 < a lt=1/2`
[c] `1/2 lt=a < 1`
[d] `0 < a < 1`

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