Find Values Of $x$ And $y$ Such That Both $f_{x}(x, y)=0$ And $f_{y}(x, y)=0$

Multiple Choice

Find values of $x$ and $y$ such that both $f_{x}(x, y) =0$ and $f_{y}(x, y) =0$ .
- $f(x, y) =12 x y-6 x^{2}+8 x$

A) $x=0, y=-\frac{2}{3}$
B) $\mathrm{x}=-\frac{2}{3}, \mathrm{y}=0$
C) $x=\frac{2}{3}, y=0$
D) $x=0, y=\frac{3}{2}$