MCQ

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Consider the following statements:

1. If $\text{A } \cap \text{B}=\phi$ then either $ \text{A}=\phi$ or $ \text{B}=\phi$
2. For $ \text{a} ≠ \text{b}, \ ({\text{a}},\text{b})=(\text{b}, \text{a})$ and $ \text{a} ≠ \text{b}$
3. If $\text{A}\subseteq \text{B}$, then $ \text{A } \times\text{A }\subseteq ( \text{A } \times\text{B })\ \cap ( \text{B} \times\text{A })$
4. If $\text{A}\subseteq \text{B}$ and $\text{C}\subseteq \text{D}$, then $ \text{A } \times\text{C }\subseteq ( \text{B} \times\text{D }) $ Which of these is/are correct?

• A
  Only $(II)$
• B
  Only $(I)$
• C
  Only $(IV)$
• ✓
  $(II), (III)$ and $(IV)$