$104$ points

Given a system $Ax=b,$ let $D$ be a matrix with diagonal terms same as the diagonal terms of A and zero everywhere. Given an initial guess of the solution $x_0,$ the next estimate can be computed as

$x_1=x_0-$inv$(D)**(b-A^{**}{x}_{})$;

$x_1=x_{}+D^{**}(b-$inv$(A)**x_{})$;

$x_1=x_{}+D^{**}(b-A^{**}{x}_{})$;

$x_1=x_{}+$inv$(D)**(b-A^{**}{x}_{})$;