1. What is the differential for the total surface area of a frustum of a cone with l as the slant height? A. dSA = n[(l+ 2R)dR + (l + 2r)dr] B. dSA = T[(l + 2R)dR + (l + 2r)dr + (R+r)dl] C. dSA = a[(R+r)dl + (l + 2r)dr + 2RDR] D. dSA = 21[(l + 2r)dr + (R +r)dl] %3D %3D

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