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Multiple Choice: The function is bounded by the -axis and the line . The volume of the solid generated by revolving the region about the -axis can be computed by which of the following integrals?

A. I only

B. II only

C. III only

D. I and II

E. I and III

If you want to use disks/washers, then rotate horizontal rectangles.
This means that both the bounds and the integrand must be written in terms of .

If you want to use shells, then use -values.