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Let A, B, C and D be four non-empty sets. The contrapositive statement of "If A ⊆ B and B ⊆ D, then A ⊆ C" is:

1. If A ⊆ C, then A ⊆ B and B ⊆ D
2. If A ⊆ C, then A ⊆ B and B ⊆ D
3. If A ⊆ C, then A ⊆ B or B ⊆ D
4. If A ⊆ C, then B ⊂ A or D ⊂ B

Correct answer: If A ⊆ C, then A ⊆ B or B ⊆ D

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