The Function Graphed Is of the Form $$y = \cos x + c , y = \sin x + c , y = \cos ( x - d ) , \text { or } y = \sin ( x - d )$$

Multiple Choice

The function graphed is of the form $$y = \cos x + c , y = \sin x + c , y = \cos ( x - d ) , \text { or } y = \sin ( x - d )$$ where d is the least possible
positive value. Determine the equation of the graph.
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A) $y = \sin ( x - 1 )$
B) $y = \sin x - 1$
C) $y = \cos ( x + 1 )$
D) $y = \cos x - 1$