# Do you know its property ? -5

Algebra Level 5

Concerning the function:

$f(x)=\begin{cases} 2 ,\ \ \text{if}\ \space x\in\mathbb{Q}\\-2,\ \ \text{if}\ \space x\notin\mathbb{Q}\ \end{cases},$

which of the following statement(s) is/are correct?

1. It is periodic with period 1

2. It is periodic with period 2

3. It is non-periodic

4. It is periodic but fundamental period is not defined.

Note: $$\mathbb{Q}$$ represents the set of rational numbers.

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