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Which of the following is the direction vector of the line $$\left\{\begin{array}{l} x=2+t \\ y=-1-t, t \in \mathbb{R} \\ z=t \end{array}\right.$$

A) $(2,-1,1)$

B) $(2,-1,0)$

C) $(0,-1,1)$

D) $(1,-1,2)$

E) $(1,-1,1)$
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