Find the Exact Value of the Expression $\sec 150 ^ { \circ }$

Multiple Choice

Find the exact value of the expression.
- $\sec 150 ^ { \circ }$

A) $- \sqrt { 2 }$
B) $\frac { 2 \sqrt { 3 } } { 3 }$
C) $- \frac { 2 \sqrt { 3 } } { 3 }$
D) $\sqrt { 2 }$