Consider the following augmented matrices: A=[1 2 −1 0 0 0 1 −3 0 1 0 −2], B=[1 0 0 1 0 1 0 0 0 0 0 1], C=[5 2 −1 0 0 1 4 −3 0 0 0 −2]. Select the correct option for each matrix. The matrix A is [ Select ] in row echelon form but not reduced row echelon form not in row echelon form in reduced row echelon form . The matrix B is [ Select ] in reduced row echelon form in row echelon form but not reduced row echelon form not in row echelon form . The matrix C is [ Select ] in row echelon form but not reduced row echelon form not in row echelon form in reduced row echelon form .多重下拉选择题