Describe and compare the solution sets of x_1 + 4x_2 - 2x_3 = 0 and x_1 + 4x_2 - 2x_3 = - 5. Describe the solution set, x = [x_1 x_2 x_3], of x_1 + 4x_2 - 2x_3 = - 5 in parametric vector form. Select the correct choice below and fill in the answer boxes within your choice. A. x = B. x = + x^3; C. x = + x_2 + x_3 D. x = x_2 + x_3