Consider the matrix-vector equation Ax=b, where A is an nbyn matrix and x and b are nby1 vectore. Suppose you are given the inputs A and b and asked two swap the i-th equation with j-th equation (so I and j are also inputs). Which code block(s) would do this correctly? (check all the apply) for k=1n t=A(i,k); A(1,k)=A(j,k) : A(0,k)=t; end t=b(i); b(i)=b(j); B(i)=t; fork=1n1=A(k,i);A(k,i)=A(k,j);A(k,j)=1; and t=b(i);b(i)=b(j);b(j)=t;fork=1:nA(i,k)=A(j,k);A(j,k)=A(i,k); end b(i)=b(j);b(j)=b(i)fork=1:nA(k,i)=A(k,j); A(j,k)=A(i,k) end b(i)=b(j)b(j)=b(i) fork=1:n A(k,i)=A(k,j) A(k,j)=A(k,i) end b(i)=b(j)b(j)=b(i)