If $a, b, c, d$ and $p$ are different real numbers such that $(a^2 + b^2 + c^2)p^2 - 2(ab + bc + cd)p + (b^2 + c^2 + d^2) \le 0$,then $a, b, c, d$ are in

  • A
    $A.P.$
  • B
    $G.P.$
  • C
    $H.P.$
  • D
    $ab = cd$

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