A company that manufactures storage bins for grains made a drawing of a silo. The silo has a conical base, as shown below:

Which of the following could be used to calculate the total volume of grains that can be stored in the silo?

π(2ft)2(8ft) + one over threeπ(2ft)2(9.5ft − 8ft)
π(8ft)2(2ft) + one over threeπ(2ft)2(9.5ft − 8ft)
π(2ft)2(8ft) + one over threeπ(9.5ft − 8ft)2(2ft)
π(8ft)2(2ft) + one over threeπ(9.5ft − 8ft)2(2ft)