Suppose A is a symmetric matrix with positive eigenvalues, the smallest of which is .2 and the largest of which is 2. Suppose we wish to approximately solve the system Ax = b through iteration without knowing the true solution x*, and our approximation at the kth iteration is xk). Suppose ||b||2 = 4. If we wish the relative error w.r.t. the 2-norm to be less than 10-³, what should we use as a stopping condition involving the residual error, and why?