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

Multiple Choice

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

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