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