If the Slope of the Function $f(x)=4 X_{2}-24 X+32$ Is 0 At

Multiple Choice

If the slope of the function $f(x) =4 X_{2}-24 X+32$ is 0 at $X=3$ , then it follows that $X=3$ is a

A) local maximum
B) local minimum
C) global maximum
D) saddle point