If a unit vector is represented as $\overrightarrow{u} = 0.4 \hat{i} + 0.7 \hat{j} + c \hat{k}$,then the value of '$c$' is
- A$\sqrt{0.11}$
- B$\sqrt{0.25}$
- C$\sqrt{0.65}$
- D$\sqrt{0.35}$
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