If $r_1=2 \hat{x}$ and $r_2=2 \hat{y}$, where $\hat{x}$ and $\hat{y}$ are unit vectors along the $X$-axis and $Y$-axis respectively, then the magnitude of $r_1+r_2$ is
- A$2 \sqrt{2}$
- B$2 \sqrt{3}$
- C$3 \sqrt{2}$
- D$\sqrt{3}$
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