Evaluate, If Possible, the Given Trigonometric Function at the Indicated $\sec t , t = \frac { 5 \pi } { 6 }$

Multiple Choice

Evaluate, if possible, the given trigonometric function at the indicated value.
$\sec t , t = \frac { 5 \pi } { 6 }$

A) $- \frac { 2 \sqrt { 3 } } { 3 }$
B) 2
C) $- 2$
D) $- \frac { \sqrt { 3 } } { 2 }$
E) not possible