A series of figures are given which can be grouped into classes. Select the group into which the figures can be classified from the given responses.
1
1, 4, 5; 2, 6, 8; 3, 7, 9
2
1, 3, 7; 4, 6, 9; 2, 5, 8
3
1, 3, 7; 2, 5, 8; 4, 6, 9
4
1, 3, 8; 2, 5, 7; 4, 6, 9