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Direction: In each of the following questions, a set of some figures is given. Group these figures into three classes on the basis of their identical properties using each figure only once.

A) 1, 5, 7; 2, 3, 9; 4, 6, 8                     

B) 3, 2, 1; 4, 6, 5; 9, 7, 8

C) 2, 4, 5; 9,1, 3; 7, 8, 6                     

D) 1, 3, 9; 2, 4, 6; 5, 7, 8