If $ab + bc + ca = 0$ and $\begin{vmatrix} a - x & c & b \\ c & b - x & a \\ b & a & c - x \end{vmatrix} = 0$,then one of the values of $x$ is

  • A
    $(a^2 + b^2 + c^2)^{\frac{1}{2}}$
  • B
    $\left[ \frac{3}{2}(a^2 + b^2 + c^2) \right]^{\frac{1}{2}}$
  • C
    $\left[ \frac{1}{2}(a^2 + b^2 + c^2) \right]^{\frac{1}{2}}$
  • D
    None of these

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