Solve the Problem $y = \frac { 1 } { 2 } \cosh 2 x$

Multiple Choice

Solve the problem.
-Find the length of the segment of the curve $y = \frac { 1 } { 2 } \cosh 2 x$ from $x = 0$ to $x = \ln \sqrt { 5 }$ .

A) $\frac { 13 } { 10 }$
B) $\frac { 6 } { 5 }$
C) 5
D) $\frac { 1 } { 4 } \left( \sqrt { 5 } - \frac { 1 } { \sqrt { 5 } } \right)$