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The function f:xtoY defined by f(x)=x^(2...

The function `f:xtoY` defined by `f(x)=x^(2)-4x+5` is both one-one and onto if

A

`X=[2,oo)` & `Y=[1,oo)`

B

`X=(-oo,2]` & `Y=[1,oo)`

C

`X=[3,oo)` & `Y=[2,oo)`

D

`X=(-oo,2]` & `Y=(1,oo)`

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The correct Answer is:
A, B, C
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