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Which of the following statements are true?

The set of all prime numbers is a subset of the integers.

$\mathbb{kZ} \subset \mathbb{Z}$, where $k \in \mathbb{Q}$

$\mathbb{N} \subset \mathbb{Z}$

$\mathbb{kZ} \subset \mathbb{Z}$, where $k \in \mathbb{Z}$