Which is the simplified form of (ABC)′ · (A′ + B′ + C′)?

Which is the simplified form of (ABC)′ · (A′ + B′ + C′)?

  1. a) A′ + B′ + C′
  2. b) A′B′C′
  3. c) (ABC)′
  4. d) ((ABC)′)′

From the Combined Bank Assistant Engineer (IT) 2020 – Preliminary exam, question 31 of 37.

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