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

  • A
    they move across the junction by the potential difference.
  • B
    hole concentration in $p-$region is more as compared to $n-$region.
  • C
    free electrons in the $n-$region attract them.
  • D
    All the above

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