If
'P + Q' means 'P is the father of Q',
'P − Q' means 'P is the mother of Q',
'P / Q' means 'P is the sister of Q',
'P U Q' means 'P is the son of Q',
'P ∩ Q' means 'P is the daughter of Q',
then which of the following means that ' A is E's daughter's son?
1
A ∩ B ∩ C / D + E
2
A / B ∪ C ∪ D / E
3
A / B + C − D U E
4
A ∪ B / C / D ∪ E