(1 point) In this problem, answer "True" or "False" for each question. Note: there is no partial credit for this problem. You must answer all parts correctly to receive credit. You will not be show the correct answers for individual parts. 1. If A, B, C are matrices of the same size, then their product ABC is invertible. O True O False 2. Let A, B, C be 2 x 2-matrices. If A is invertible and AB = AC, then B = C. O True O False 3. Let A, B be 3 x 3-matrices. If AB = 0 then A = 0 or B = 0. O True O False 4. If A- and B-1 both exist and A-1 B-1 = B-1A-1, then AB = BA. O True O False