If $1,\;{\log _y}x,\;{\log _z}y,\; - 15{\log _x}z$ are in $A.P.$, then

  • A

    ${z^3} = x$

  • B

    $x = {y^{ - 1}}$

  • C

    ${z^{ - 3}} = y$

  • D

    All the above

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