The Function Graphed Is of the Form Y = Cos $y = \cos x - 1$

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) $y = \cos x - 1$
B) $y = \sin x - 1$
C) $y = \cos ( x - 1 )$
D) $y = \sin x + 1$