If three vectors along coordinate axis represent the adjacent sides of a cube of length $b$, then the unit vector along its diagonal passing through the origin will be
- A$\frac{\hat{ i }+\hat{ j }+\hat{ k }}{\sqrt{2}}$
- B$\frac{\hat{ i }+\hat{ j }+\hat{ k }}{\sqrt{36}}$
- C$\hat{ i }+\hat{ j }+\hat{ k }$
- D$\frac{\hat{ i }+\hat{ j }+\hat{ k }}{\sqrt{3}}$
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