$\log_{7} \log_{7} \sqrt{7 \sqrt{7 \sqrt{7}}} = ?$

  • A
    $3 \log_{2} 7$
  • B
    $1 - 3 \log_{3} 7$
  • C
    $1 - 3 \log_{7} 2$
  • D
    None of these

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