If f(x) = 2x + 2 is a linear function, which of the following is true for 4f(x)?
A) The slope is four times steeper than f(x).
B) The slope is four times less steep than f(x).
C) All values of x are four times greater than f(x) for the same values of y.
D) The slope changes, but the y-intercept remains the same as f(x).
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