Evaluate ∬Dx2dA\iint_D x^2 dA∬Dx2dA over the region DDD bounded by x=0,y=0,x+y=1x=0, y=0, x+y=1x=0,y=0,x+y=1.
16\frac{1}{6}61
112\frac{1}{12}121
124\frac{1}{24}241
12\frac{1}{2}21