Find the Area or Volume $y = 8 \mathrm { e } ^ { - \mathrm { x } }$

Multiple Choice

Find the area or volume.
-Find the volume of the solid generated by revolving the area under $y = 8 \mathrm { e } ^ { - \mathrm { x } }$ in the first quadrant about the $\mathrm { x }$ -axis

A) $8 \pi$
B) $128 \pi$
C) $32 \pi$
D) $64 \pi$