Mathematics Vector Algebra Scalar and Vector Product

If \(\rm\vec u = \hat i \times ( \vec a \times \hat i) + \hat j \times ( \vec a \times \hat j) + \hat k \times ( \vec a \times \hat k) \) then \(\rm \vec u \) is equal to

1
\(\vec 0\)
2
\(\vec a\)
3
\(2 \vec a\)
4
\(3 \vec a\)

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