If X + Y means X is the mother of Y; X − Y means X is the brother of Y; X ÷ Y means X is the father of Y; X × Y means X is sister of Y, then which of the following means L is uncle of O?
1
L − M + N ÷ O
2
O ÷ M + N × L
3
L − M × N ÷ O
4
L + M − N × O