09. The LU decomposition method is computationally more efficient than Gauss elimination method for solving A) a single set of simultaneous linear equations B) a single set of simultaneous nonlinear equations C) multiple sets of simultaneous linear equations with different coefficient matrices and the same right-hand side of the constant vector D) multiple sets of simultaneous linear equations with the same coefficient matrix but different right-hand sides of constant vectors E) less than ten simultaneous linear equations