Find the Length of the Curve $r = 9 \sec \theta , 0 \leq \theta \leq \frac { \pi } { 4 }$

Multiple Choice

Find the length of the curve.
-The line segment $r = 9 \sec \theta , 0 \leq \theta \leq \frac { \pi } { 4 }$

A) 9
B) $9 \ln \left( \tan \left( \frac { 3 \pi } { 8 } \right) \right)$
C) $\frac { \pi } { 4 }$
D) $\frac { 9 } { 2 } ( \sqrt { 2 } + \ln ( \sqrt { 2 } + 1 ) )$