Find the Volume Under the Surface Z = F(x,y) and Above

Multiple Choice

Find the volume under the surface z = f(x,y) and above the rectangle with the given boundaries.
- $$z = x ^ { 2 } + y ^ { 2 } ; 0 \leq x \leq 1,0 \leq y \leq 1$$

A) $\frac { 2 } { 3 }$
B) $\frac { 1 } { 3 }$
C) $\frac { 8 } { 3 }$
D) $\frac { 4 } { 3 }$