In a tilted xy coordinate system, the acceleration vector is along the x-axis. The coordinates are tilted at an angle as shown. What are ax and ay, the x- and y-components of the vector a? A) ax = -a , ay = 0 B) ax = 0, ay = a C) ax = a , ay = 0 D) ax = a sin , ay = -a cos E) ax = a cos , ay = -a sin