In an unbiased $P-N$ junction,holes diffuse from the $p-$ region to $n-$ region because

  • A
    free $e^-$ in the $n-$ region attract them
  • B
    They move across the junction by the potential difference
  • C
    Hole concentration in $p-$ region is more as compared to $n-$ region
  • D
    All of these

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