Let A and B be the square matrices Then A and B are invertible-18700

Let A and B be the square matrices. Then A and B are invertible with \(B = A^{-1} \) and \(A = B^{-1} \) if and only if \(AB = BA \) equals to a (an) __________ matrix.

This multiple choice question (MCQ) is related to the book/course vu mth501 Linear Algebra. It can also be found in vu mth501 Final Term - Quiz No.2.