A) There are infinitely many choices for such \[\hat{v}\]
B) If \[\hat{u}\]lies in the xy-plane then \[|{{u}_{1}}|\,=\,|{{u}_{2}}|\]
C) If \[\hat{u}\] lies in the xz-plane then \[|{{u}_{1}}|\,=2|{{u}_{3}}|\]
D) All of these
E) None of these
Correct Answer: D
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