Evaluate the Expression Using the Concept of a Reference Angle $\cos \left( - 675 ^ { \circ } \right)$

Multiple Choice

Evaluate the expression using the concept of a reference angle. $\cos \left( - 675 ^ { \circ } \right)$

A) $- \frac { \sqrt { 2 } } { 2 }$
B) $\frac { \sqrt { 2 } } { 2 }$
C) $\frac { \sqrt { 2 } } { 6 }$
D) $- \frac { \sqrt { 6 } } { 2 }$
E) $\frac { \sqrt { 6 } } { 6 }$