A1. At which points on the curve, given by the equation $f(x)=x^{3}-2 x^{2}+3$, does the tangent make an angle of $135^{\circ}$ with the x-axis?
(A) $T_{1}(1,-4)$ and $T_{2}(-2,0)$.
(B) $T_{1}(1,-4)$ and $T_{2}(2,0)$.
(C) $T_{1}(1,0)$ and $T_{2}(-1,4)$.
(D) $T_{1}(1,2)$ and $T_{2}\left(\frac{1}{3}, \frac{28}{9}\right)$
(E) $T_{1}(1,2)$ and $T_{2}\left(\frac{1}{3}, \frac{76}{27}\right)$.