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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 10 Letabe a constant witha >1. Consider the curvey=a x −2. LetAbe a point on this curve that lies in the first quadrant. The vertical line throughA(i.e., the line parallel to they-axis passing throughA) meets thex-axis atB, and meets the asymptote of the curvey=a x −2 atC. Suppose that AB= BCand that the area of triangleAOCis 8, whereOis the origin. Find the value ofa× OB. [4 points] ①2 13 6 ②2 7 3 ③2 5 2 ④2 8 3 ⑤2 17 6
\boxed{③}
Comparative Analysis (P9) (Average across runs)
Averages use reported measurements only. Missing usage is not treated as zero.