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If f(1)(x) = 2x + 3, f(2)(x) = 3x^(2) + ...

If `f_(1)(x) = 2x + 3, f_(2)(x) = 3x^(2) + 5, f_(3)(x) = x + cos x` are defined from `R rarr R`, then `f_(1), f_(2)` and `f_(3)` are

A

One-one onto

B

Many one into

C

One-one -into

D

Many one onto

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The correct Answer is:
A
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