find the rank of the matrix A and B by following row operation: A= [(1,2,3,(−1)),((−2),(−1),(−3),(−1)),(1,0,1,( 1)),(0,1,1,(−1)) ] B= [(( 1),( 2),(−1),( 4)),(( 2),( 4),( 3),( 5)),((−1),(−2),( 6),(−7)) ]