In each of the following questions, group the given figures into three classes using each figure only once.
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1. Group the given figures into three classes using each figure only once.

A. 2,6,7 ; 1,5,8 ; 3,4,9
B. 2,8,7 ; 1,5,9 ; 3,4,6
C. 2,6,9 ; 1,5,7 ; 3,4,8
D. 2,4,7 ; 1,8,9 ; 3,5,6
