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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 11 At timet= 0, a pointPstarts from the origin and moves along a straight line. For a real numberk, the velocityv(t) ofPat timet(witht≥0) is given by v(t) =t 2 −kt+ 4. From the statements in⟨Box⟩, which ones are true? (Select all that apply.) [4 points] ⟨Box⟩ (a) Ifk= 0, then the position ofPat timet= 1 is 13 3 . (b) Ifk= 3, then after starting, the direction of motion ofPchanges exactly once. (c) Ifk= 5, then the distance traveled byPfromt= 0 tot= 2 is 3. ①(a) ②(a), (b) ③(a), (c) ④(b), (c) ⑤(a), (b), (c) 4
\boxed{③}
Comparative Analysis (P10) (Average across runs)
Averages use reported measurements only. Missing usage is not treated as zero.