3. Let A be an n xn matrix and let b be an n x 1 vector such that A = b has a unique solution. Let A' denote the transpose of A. Then which of the following statements is false? (A) A'r = 0 has a unique solutio. (B) A'r = c has a uniquc solution for any non-zero c. (C) Ar =c has a solution for any c. (D) A4r = c is inconsistent for some vector c.