Solve
-Find the Surface Area of the Cone Frustum Generated $y = ( x / 2 ) + ( 1 / 2 ) , 1 \leq x \leq 3$

Multiple Choice

Solve.
-Find the surface area of the cone frustum generated by revolving the line segment $y = ( x / 2 ) + ( 1 / 2 ) , 1 \leq x \leq 3$ , about the $y$ -axis.

A) $12 \pi \sqrt { 5 }$
B) $15 \pi \sqrt { 5 }$
C) $10 \pi \sqrt { 5 }$
D) $11 \pi \sqrt { 5 }$