Find the Phase Shift of the Function $$y = 4 \sin \left( 2 x - \frac { \pi } { 2 } \right)$$

Multiple Choice

Find the phase shift of the function.
- $$y = 4 \sin \left( 2 x - \frac { \pi } { 2 } \right)$$

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