$a$ and $b$ are two vectors such that $|a|=\sqrt{3}$ and $|b|=\sqrt{2}$. If $x$ is a unit vector satisfying $x \times a = b$,then $x$ is equal to:

  • A
    $\frac{1}{2}[(x \cdot a) a - b \times a]$
  • B
    $\frac{1}{2}[\pm(x \cdot a) a + (b \times a)]$
  • C
    $\frac{1}{2}[(x \cdot a) a + b \times a]$
  • D
    $\frac{1}{3}(a \times b + a)$

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