Find an Equation for the Surface of Revolution Generated by Revolving

Multiple Choice

Find an equation for the surface of revolution generated by revolving the curve $x z = 3$ in the $x z$ -plane about the $z$ -axis.

A) $y ^ { 2 } + z ^ { 2 } = \frac { 9 } { x ^ { 2 } }$
B) $z ^ { 2 } + x ^ { 2 } = \frac { 9 } { y ^ { 2 } }$
C) $y ^ { 2 } + z ^ { 2 } = \frac { 3 } { x ^ { 2 } }$
D) $y ^ { 2 } + x ^ { 2 } = \frac { 3 } { z }$
E) $y ^ { 2 } + x ^ { 2 } = \frac { 9 } { z ^ { 2 } }$