If $x = \log_a(bc)$,$y = \log_b(ca)$,and $z = \log_c(ab)$,then which of the following is equal to $1$?

  • A
    $x + y + z$
  • B
    $(1 + x)^{-1} + (1 + y)^{-1} + (1 + z)^{-1}$
  • C
    $xyz$
  • D
    None of these

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