Set up, but do not evaluate, an integral for the area of the surface obtained by rotating the curve y=lnx about the x-axis on the interval 1≤x≤4. Select the correct answer. a. ∫ 4
1
2πx 1+(1/x) 2
dx b. ∫ 1
4
2πx 1+(1/x) 2
dx c. ∫ 1
4
2πln(x) 1+(1/x) 2
dx d. ∫ 4
1
2πxln(x) 1+(1/x) 2
dx e. ∫ 4
1
2π x+(1/x) 2
dx