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Which of the following is true?

  1. A silicon wafer heavily doped with boron is a $p^{+}$substrate
  2. A silicon wafer lightly doped with boron is a $p^{+}$ substrate
  3. A silicon wafer heavily doped with arsenic is a $\mathrm{p}^{+}$substrate
  4. A silicon wafer lightly doped with arsenic is a $p^{+}$ substrate

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