Write a Set of Parametric Equations for the Surface of Revolution

Multiple Choice

Write a set of parametric equations for the surface of revolution obtained by revolving the graph of the function about the given axis.
$y = \frac { x } { 7 } , 0 \leq x \leq 21 \quad x \text {-axis }$

A)
$z = u , x = \frac { u } { 7 } \cos v , y = \frac { u } { 7 } \sin v , 0 \leq u \leq 21,0 \leq v \leq 2 \pi$
B)
$y = u , x = \frac { u } { 7 } \cos v , z = \frac { u } { 7 } \sin v , 0 \leq u \leq 21,0 \leq v \leq 2 \pi$
C)
$x = u , y = \frac { v } { 7 } \sin v , z = \frac { v } { 7 } \cos v , 0 \leq u \leq 21,0 \leq v \leq 2 \pi$
D)
$y = u , x = \frac { u } { 7 } \sin v , z = \frac { u } { 7 } \cos v , 0 \leq u \leq 21,0 \leq v \leq 2 \pi$
E)
$x = u , y = \frac { u } { 7 } \cos v , z = \frac { u } { 7 } \sin v , 0 \leq u \leq 21,0 \leq v \leq 2 \pi$