Consider the solid that lies above the rectangle (in the xy-plane) R=[2,2][0,2],and below the surface z=x25y+10.(A) Estimate the volume by dividing R into 4 rectangles of equal size, each twice as wide as high, and choosing the sample points to result in the largest possible Riemann sum.Riemann sum =(B) Estimate the volume by dividing R into 4 rectangles of equal size, each twice as wide as high, and choosing the sample points to result in the smallest possible Riemann sum.Riemann sum =(C) Using iterated integrals, compute the exact value of the volume.Volume =