(2) Give a solid and sound mathematical reason for your choice, include pic- ture/graph/diagram if possible. Clearly identify each part. Circle all correct answers for each of the following questions. Consider the inte- grals dx dy. (a) The area of a triangle in the ry-plane corresponds to A B C None of the above. (b) The area of a region in the ry-plane bounded on a side by a parabola corre- sponds to A B C None of the above. (c) The volume under the surface z = x2 above a triangle in the ry-plane corre- sponds to A B C None of the above. (d) The volume under the plane z = 1 above a triangle in the ry-plane corresponds to A B C None of the above. Give a solid and sound mathematical reason for your choice, include picture/graph/diagram if possible. Clearly identify each part