Write an iterated integral for dA over the region R described to the R right using a. vertical cross-sections, y = 5X b. horizontal cross-sections. y=x2 X a. Write the correct iterated integral using vertical cross-sections. Select the correct answer below and fill in the answer boxes to complete your choice. OA . J Jaxdy OB. [ dy dx b. Write the correct iterated integral using horizontal cross-sections. Select the correct answer below and fill in the answer boxes to complete your choice OA. | | dy dx OB. dx dy