If ${{\log x} \over {b - c}} = {{\log y} \over {c - a}} = {{\log z} \over {a - b}},$ then which of the following is true

  • A

    $xyz = 1$

  • B

    ${x^a}{y^b}{z^c} = 1$

  • C

    ${x^{b + c}}{y^{c + a}}{z^{a + b}} = 1$

  • D

    All of These

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