Multiple Choice: The graph of $x^{2} + y^{2} = 4$ is:

1. a parabola with y-intercept $\left(0, 4\right)$

2. a circle with radius $4$ and center $\left(0, 0\right)$

3. a parabola with x-intercepts $\left(−2, 0\right)$ and $\left(2, 0\right)$

4. a circle with radius $2$ and center $\left(0, 0\right)$

5. None of these