# If $\alpha,\beta,\gamma$ are the roots of $x^3-2x^2+3x-4=0,$ then the value of $\alpha^2\beta^2+\beta^2 \gamma^2+\gamma^2 \alpha^2$ is

$\begin {array} {1 1} (a)\;-7 & \quad (b)\;-5 \\ (c)\;-3 & \quad (d)\;0 \end {array}$

(a) -7