Find the Exact Value of the Expression $- 1$ B) $\frac { \sqrt { 2 } } { 2 }$

Multiple Choice

Find the exact value of the expression.
-sec (-1215°)

A) $- 1$
B) $\frac { \sqrt { 2 } } { 2 }$
C) $- \frac { \sqrt { 3 } } { 3 }$
D) $- \sqrt { 2 }$