From this equation, there are four possible equations of line:
2x+3y<=6
-2x+3y<=6
-2x-3y<=6
2x-3y<=6
All these lines will enclose an area of a triangle = (1/2*2*3) = 3 units square
Since there are four such triangles and figure is symmetric, total area enclosed will be = 3*4 = 12 square units (Correct Answer)