3. Group the given figures into three classes using each figure only once.
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A. 3,2,4 ; 6,5,8 ; 7,9,1
B. 1,3,5 ; 2,6,8 ; 4,7,9
C. 1,3,5 ; 2,6,9 ; 4,7,8
D. 2,3,4 ; 5,6,8 ; 9,1,7
