3 -1 Let P = 2 0 -2 a where a R. Suppose Q = [q] is a matrix such that PQ = kI, where k = R, k = 0 3-5 0 and I is the identity matrix of order 3. If 923 (A) a = 0, k=8 (C) det(P adj(Q)) = 2 k 8 and det(Q)=- 2 " then (B) 4a-k+8=0 (D) det(Q adj(P)) = 23