19. ifp (a) denotes the rank of a matrix a, then p (ab) is equal to: (a) p (a) (b) p (b) (c) less than or equal to min {p (a), p (b)} (d) greater than min {p (a

19. Ifp (A) denotes the rank of a matrix A, then p (AB) is equal to: (a) p (A) (b) p (B) (c) less than or equal to min {p (A), p (B)} (d) greater than min {p (A), p (B)}