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1. Which of the following are right triangles?
A. Triangle ABC with AC = 6, BC = 9, and AB = 12
B. Triangle DEF with DE = 8, EF = 10, and FD=13
C. Triangle GHI with GI = 9, HI= 12, and GH = 15
D. Triangle JKL with JL = 10, KL = 13, and JL = 17