Answer Happy

Which of the following is not a subspace of R3? O {(:11, 12, 13) | 11 + 13 = 0} {(11, 12, 13) | 21 = 12 = 13} O {(21, 22, 23) | 03 = (1 + x2} {(21, 22, 23) 23 = 0} O {(C1, C2, C3) | 13 = 11 or 13 = 12}