$\begin{array}{1 1}(A)\;a = \large\frac{2}{3} ; b = 2 \\(B)\; a = \large\frac{3}{2}; b = -2 \\(C)\; a = \large\frac{2}{3} ; b = -2 \\(D)\;a = -\large\frac{2}{3} ; b = 2 \end{array} $