'A + B' means 'A' is the sister of 'B'.
'A @ B' means 'A' is the wife of 'B'.
'A $ B' means 'A' is the son of 'B'.
'A % B' means 'A' is the mother of 'B'.
What is the relation between 'S and P' in the given expression "P @ Q $ R % S + O"?
1
Sister
2
Brother
3
Sister-in-law
4
Mother