Which of the following are correct?

1.The contraposition of I (some S is P) is "Some non-P is non-S"

2.The contraposition of A (All S is P) is "All non-P is non-S"

3.The converse of O (some S is not P) is "Some S is P"

4.The converse of E (No S is P) is "No P is S"

5.The obverse of O (Some S is not P) is "Some S is non-P"

A1, 3 and 4

B2, 4 and 5

C2, 3 and 4

D1, 2 and 5

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