If $|\vec{a} + \vec{b}| = |\vec{a} - \vec{b}|$, then

Question

$\vec{a}$ and $\vec{b}$ are coincident.

Inclined to each other at $60^{\circ}$.

$\vec{a}$ and $\vec{b}$ are perpendicular.

$\vec{a}$ and $\vec{b}$ are parallel.

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