Find the Exact Value of the Function $- \frac { \sqrt { 3 } } { 3 }$

Multiple Choice

Find the exact value of the function. Rationalize the denominator if necessary.
-cot 150°

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