(7) Which of the statements a.b.c, and d is not correct? If you think all are correct, pick e. In this question, is an integer and it is at least 2 . (a) Let A be an n by n matrix. If there is an n by n matrix B such that AB=I, then BA=I. (b) Let 0n be the n by n zero matrix and A be ann by n matrix. If A2=0n then A=0n. (c) Let A and B be n by n matrices, If A and B are invertible, then AB is anvectible. (d) Let A be an inwertible n by n matrix. If A can be reduced to a row echelon fotur without performing row exchanges, then A has a unique unitary LU factorization. (Every diagonal entry of L is 1. ) (c) None of the above. cotient, perk itsui in eres. (7) Which of the statements a.b.c, and d is not correct? If you think all are correct, pick e. In this question, is an integer and it is at least 2 . (a) Let A be an n by n matrix. If there is an n by n matrix B such that AB=I, then BA=I. (b) Let 0n be the n by n zero matrix and A be ann by n matrix. If A2=0n then A=0n. (c) Let A and B be n by n matrices, If A and B are invertible, then AB is anvectible. (d) Let A be an inwertible n by n matrix. If A can be reduced to a row echelon fotur without performing row exchanges, then A has a unique unitary LU factorization. (Every diagonal entry of L is 1. ) (c) None of the above. cotient, perk itsui in eres