P and Q are centres of two circles whose radii are 7 cm and 3 cm, respectively. If the direct common tangents to the circles meet PQ extended at A, then A divides PQ ________.
1
externally in the ratio 3 : 7
2
internally in the ratio 3 : 7
3
externally in the ratio 7 : 3
4
internally in the ratio 7 : 3