If $\vec{a}$ and $\vec{b}$ are unit vectors such that $\vec{a} - \vec{b}$ is also a unit vector, then the angle between $\vec{a}$ and $\vec{b}$ is:

Question

$\frac{\pi}{6}$

$\frac{\pi}{3}$

$\frac{\pi}{4}$

$\frac{\pi}{2}$

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