Let x ER Then which of the following options is/are correct? For x = 0, if Ra = 6 a, then a + b = 5 0-4 b b A. B. C. D. For x = 1, there exists a unit vector ai +Bi+yk for which RB-0 = Y 2 x X det R= det 0 4 0 +8, for all x = R X x 5 There exists a real number x such that PQ = QP 0 0