Which of the following is an example of the null set?
$\{ x : x \in \mathbb{N}, x < 5 \text{ and } x > 7 \}$
$\{ x : x \in \mathbb{N}, x < 5 \text{ and } x > 7 \}$
- A$\{ x : x \in \mathbb{N}, x < 5 \}$
- B$\{ x : x \in \mathbb{N}, x < 5 \text{ and } x > 7 \}$
- C$\{ x : x \in \mathbb{N}, x > 5 \}$
- D$\{ x : x \in \mathbb{N}, x = 5 \}$
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