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This is a Korean CSAT mathematics multiple-choice problem. Solve it and put only the correct choice symbol, one of ①, ②, ③, ④, ⑤, inside \boxed{}.
Problem 26 Consider the solid whose base in thexy-plane is the region bounded by the curve y= √ x+xlnx, thex-axis, and the vertical linesx= 1 andx= 2. The cross-sections of this solid taken by planes perpendicular to thex-axis are all equilateral triangles. Find the volume of this solid. [3 points] ① √ 3(3 + 8 ln 2) 16 ② √ 3(5 + 12 ln 2) 24 ③ √ 3(1 + 12 ln 2) 16 ④ √ 3(1 + 2 ln 2) 4 ⑤ √ 3(1 + 9 ln 2) 12 14
\boxed{①}
Comparative Analysis (P33) (Average across runs)
Averages use reported measurements only. Missing usage is not treated as zero.