Which of the following curves are traversed exactly once as t increases from to to t? O x = cos (2t), y = sin (2t) with to = 0 and t1 = 37/2 x = cost, y = sin (2t) with to = -7/2 and t1 = 1/2 OO x = cost, y = sint with to = -7 and t1 = 3x/2