Classify the quadratic form below. Then make a change of variable, x = Py, that transforms the quadratic form into one with no cross-product term. Write the new quadratic form. 2 4x1 2 + 4x3 4X2 2 + 2 OA. Positive definite B. Negative definite +4x4 +8x1x2 + 8x3x4 + 6x1x4 - 6x2x3 What is the most precise classification for the quadratic form? OC. Indefinite OD. Positive semidefinite E. Negative semidefinite The new quadratic form is y¹ Dy=.