Find the Phase Shift of the Function $$y = - 5 \sin \left( \frac { 1 } { 2 } x - \frac { \pi } { 2 } \right)$$

Multiple Choice

Find the phase shift of the function.
- $$y = - 5 \sin \left( \frac { 1 } { 2 } x - \frac { \pi } { 2 } \right)$$

A) $\frac { \pi } { 5 }$ units to the left
B) $\pi$ units to the right
C) $\frac { \pi } { 4 }$ units to the left
D) $\frac { \pi } { 2 }$ units to the right