Find the area of the surface obtained by revolving the given curve about the $x$-axis.
$y = \frac { e ^ { x } + e ^ { - x } } { 2 }$ on $[ 0 , \ln 3 ]$
A) $\pi \ln 3$
B) $\pi \left( \frac { 20 } { 9 } + \ln 3 \right)$
C) $\frac { 20 } { 9 } \pi$
D) $\frac { \pi } { 3 } \left( \frac { 20 } { 9 } + \ln 3 \right)$

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The Answer of Find the area of the surface obtained by revolving the given curve about the $x$-axis.
$y = \frac { e ^ { x } + e ^ { - x } } { 2 }$ on $[ 0 , \ln 3 ]$
A) $\pi \ln 3$
B) $\pi \left( \frac { 20 } { 9 } + \ln 3 \right)$
C) $\frac { 20 } { 9 } \pi$
D) $\frac { \pi } { 3 } \left( \frac { 20 } { 9 } + \ln 3 \right)$

Find the Area of the Surface Obtained by Revolving the Given