If the function f(x) = x^(2) -kx is mono...

If the function `f(x) = x^(2) -kx` is monotonically increasing the interval `(1, oo)`, then which one of the following is correct ?

A

`k lt 2`

B

`2 lt k lt 3`

C

`3 lt k lt 4`

D

`k gt 4`

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