Compute the area of the bounded by the line $x+2y=2,y-x=1$ and $2x+y=7.$

Question

This question has appeared in model paper 2012.

$\begin{array}{1 1}(A) 6\;sq.units \\ (B)3\;sq.units \\ (C) 4\;sq.units \\ (D)12 sq.units \end{array} $