In a certain code language,
A + B means 'A is the father of B'
A - B means 'A is the brother of B'
A × B means 'A is the mother of B'
A ÷ B means 'A is the sister of B'
Based on the above, how is I related to M if 'I + J ÷ K × L - M'?
1
Father
2
Father's brother
3
Mother's father
4
Father's father