Find the Phase Shift of the Function $$y = 5 \sin \left( 4 x - \frac { \pi } { 2 } \right)$$

Multiple Choice

Find the phase shift of the function.
- $$y = 5 \sin \left( 4 x - \frac { \pi } { 2 } \right)$$

A) $\frac { \pi } { 2 }$ units to the left
B) $\frac { \pi } { 8 }$ units to the right
C) $4 \pi$ units down
D) $5 \pi$ units up