Let the set \(A = \{ m^2 + e^{-n} + \frac{1}{n} | \ \ m \in \mathbb{R}, n \in \mathbb{N}\}\) then the limit points of A are
1
Always natural number but countable
2
Always irrational number number but uncountable
3
Always real number but uncountable
4
Does not exist any limit point