Find the intervals in which the function...

Find the intervals in which the function f given by `f (x) = x^(2) – 4x + 6` is strictly increasing:

A

`(-oo, 2) cup (2, oo)`

B

`(2, oo)`

C

`(-oo, 2)`

D

`(-oo, 2] cup (2, oo)`

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