Evaluate $\iint_{S} f(x, y) d S$ , Where $f(x, y)=x+y$

Multiple Choice

Evaluate
$\iint_{S} f(x, y) d S$ , where $f(x, y) =x+y$ and $S$ is given by $\mathbf { r } ( u , v ) = 8 \cos u \mathbf { i } + 8 \sin u \mathbf { j } + v \mathbf { k } , 0 \leq \mathrm { u } \leq \frac { \pi } { 2 } , 0 \leq v \leq 4$

A) 8
B) 32
C) 16
D) 96
E) 512