If $a,b,c$ are in $A.P.$, then ${2^{ax + 1}},{2^{bx + 1}},\,{2^{cx + 1}},x \ne 0$ are in

  • A

    $A.P.$

  • B

    $G.P.$ only when $x > {\rm{0}}$

  • C

    $G.P.$ if $x < 0$

  • D

    $G.P.$ for all $x \ne 0$

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