The Function Graphed Is of the Form Y = Cos $\sin \left( x - \frac { \pi } { 2 } \right)$

Multiple Choice

The function graphed is of the form y = cos x + c, y = sin x + c, y = cos(x - d) , or y = sin(x - d) , where d is the least possible
positive value. Determine the equation of the graph.
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A) $\sin \left( x - \frac { \pi } { 2 } \right)$
B) $\cos x - \frac { \pi } { 2 }$
C) $\cos \left( x - \frac { \pi } { 4 } \right)$
D) $\cos \left( x - \frac { \pi } { 2 } \right)$