The electron of a free hydrogen atom is initially in a state with quantum numbers n = 3 and = 2. It then makes an electric dipole transition to a lower energy state. Which one of the given states could it be in after the transition? (a) 11 = 2, (c) n = 3, f = 1 P = 0 (b) (d) 12 = 2, n = 3, = 2 l = 1