Do the columns of A span R4? Does the equation Ax = b have a solution for each b in R¹? 1 4 -1 -5 0 2 2-4 A = 2 3 -7 0 -3-9 6 12 Do the columns of A span R4? Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or decimal for each matrix element.) A. Yes, because the reduced echelon form of A is 10-50 01 10 B. No, because the reduced echelon form of A is 0 0 0 1 0 0 0 0 Does the equation Ax = b have a solution for each bin R4? OA. No, because the columns of A do not span R4. OB. Yes, because A does not have a pivot position in every row. OC. Yes, because the columns of A span R4. OD. No, because A has a pivot position in every row.