Find the Derivative of the Function at P0 in the Direction

Multiple Choice

Find the derivative of the function at P0 in the direction of u.
- $$f ( x , y ) = - 3 x ^ { 2 } - 10 y , \quad P _ { 0 } ( - 8 , \quad ) , \quad \mathbf { u } = 3 \mathbf { i } - 4 \mathbf { j }$$

A) 56
B) $\frac { 328 } { 5 }$
C) $\frac { 184 } { 5 }$
D) $\frac { 232 } { 5 }$