Find the Second-Order Partial Derivative $f_{x y}$ When $f(x, y)=8 x^{3} y-7 y^{2}+2 x$

Find the second-order partial derivative.
-Find $f_{x y}$ when $f(x, y) =8 x^{3} y-7 y^{2}+2 x$ .

A) -14
B) $48 x y$
C) -28
D) $24 x^{2}$