Which description matches the transformations y=cosx undergoes to produce y = - 2cos3x
A. Horizontal compression by factor 1/3, vertical stretch by factor 2, then a reflection through the x-axis
B. reflection through the y-axis, vertical shift of 2 units, horizontal shift right by 3 units
C. Horizontal shift 2 units, then vertical shift up by 3 units
D. Horizontal stretch by factor 2, reflection through the x-axis, then the vertical stretch by factor 3
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