In a certain region of space,the potential is given by: $V = k[2x^2 - y^2 + z^2]$. The electric field at the point $(1, 1, 1)$ has magnitude =

  • A
    $k\sqrt{6}$
  • B
    $2k\sqrt{6}$
  • C
    $2k\sqrt{3}$
  • D
    $4k\sqrt{3}$

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