यदि $\frac{\log x}{a^{2}+a b+b^{2}}=\frac{\log y}{b^{2}+b c+c^{2}}=\frac{\log z}{c^{2}+c a+a^{2}}$,तो $x^{a-b} \cdot y^{b-c} \cdot z^{c-a}=$

  • A
    $0$
  • B
    $-1$
  • C
    $1$
  • D
    $2$

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