Write the set $A = \{ 1, 4, 9, 16, 25, \dots \}$ in set-builder form.
- A$A = \{ x : x = n^2, n \in \mathbb{N} \}$
- B$A = \{ x : x = n, n \in \mathbb{N} \}$
- C$A = \{ x : x = 2n, n \in \mathbb{N} \}$
- D$A = \{ x : x = n^3, n \in \mathbb{N} \}$
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