If ${2^x} = {4^y} = {8^z}$ and $xyz = 288,$ then ${1 \over {2x}} + {1 \over {4y}} + {1 \over {8z}} = $

  • A

    $11/48$

  • B

    $11/24$

  • C

    $11/8$

  • D

    $11/96$

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