In an $N$-type semiconductor,where are the donor energy levels $E_D$ located?

  • A
    The donor energy levels $E_D$ are located very close to the valence band energy level $E_V$.
  • B
    The donor energy levels $E_D$ are located very close to the conduction band energy level $E_C$.
  • C
    The donor energy levels $E_D$ are located exactly in the middle of the $E_C$ and $E_V$ energy levels.
  • D
    The donor energy levels $E_D$ are located close to both $E_C$ and $E_V$ energy levels.

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