Two sets AA and BB are defined as follows:-

$$AA = \left\{x \mid x \in N, x < 5\right\}$$

$$BB = \left\{x \mid x \in N, x^2 < 25\right\}$$

Which of the following alternatives is correct?

A

$$AA = BB$$

B

$$n(AA) > n(BB)$$

C

$$n(AA) < n(BB)$$

D

$$n(AA) \leq n(BB)$$