If 'A + B' means 'A is father of B', 'A * B' means 'A is the mother of B', 'A $ B' means 'A is the brother of B' and 'A @ B' means 'A is the sister of B', then in the given expression P @ Q + D $ B, how is P related to B?
1
Mother
2
Aunt
3
Sister
4
Daughter