Consider the following three systems of linear equations, which I have put into reduced row echelon form for you: Ax-b : By - c 1 Cz-d : 010 01 0 1 1 0 000 000 000 0 You do not need to show your work for this question. (a) (1 point) How many solutions do each of these linear systems have? (b) (2 points) Find all solutions to each of the three systems. (e) (1 point) Which of A, B, and C are invertible? D (d) (1 point) What are the ranks of A. B. and C