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Which of the following vectors are unit vectors?

Select ALL that apply.

A

$\begin{bmatrix} 1\\\ 0 \end{bmatrix}$

B

$\begin{bmatrix} 0\\\ -1\end{bmatrix}$

C

$\begin{bmatrix} 1\\\ 1\end{bmatrix}$

D

$\begin{bmatrix} 2\\\ -1\end{bmatrix}$

E

$\begin{bmatrix} 0\\\ 0\end{bmatrix}$

F

$\begin{bmatrix} 2\\\ -3\end{bmatrix}$

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