Which of the following is a unit vector?
- A$\hat{ i }+\hat{ j }$
- B$\cos \theta \hat{ i }-\sin \theta \hat{ j }$
- C$\sin \theta \hat{ i }+2 \cos \theta \hat{ j }$
- D$\frac{1}{\sqrt{3}}(\hat{ i }+\hat{ j })$
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