The electric potential $V$ at any point $O$ ($x$, $y$, $z$ all in metres) in space is given by $V = 4{x^2}\,volt$. The electric field at the point $(1m,\,0,\,2m)$ in $volt/metre$ is

  • [IIT 1992]
  • A

    $8$ along negative $X - $ axis

  • B

    $8$ along positive $X - $ axis

  • C

    $16$ along negative $X - $ axis

  • D

    $16$ along positive $Z - $ axis

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