C-11-Q078mediumsingle_mcqIf A(t,3t)A(t, 3t)A(t,3t), B(t2,2t)B(t^2, 2t)B(t2,2t), C(t−2,t)C(t-2, t)C(t−2,t), D(1,1)D(1, 1)D(1,1) and AB∥CDAB \parallel CDAB∥CD, the admissible values of ttt are —a1, 2b-1, 2c1, -2d-1, -2