Rewrite the Expression in Terms of Exponentials and Simplify the Results

Multiple Choice

Rewrite the expression in terms of exponentials and simplify the results.
- $\sinh ( 4 \ln x )$

A) $\frac { 1 } { 2 } \left( x ^ { 4 } + \frac { 1 } { x ^ { 4 } } \right)$
B) $\frac { 1 } { 2 } \left( x ^ { 4 } - \frac { 1 } { x ^ { 4 } } \right)$
C) $2 \left( x - \frac { 1 } { x } \right)$
D) $2 x$