5. In general, a NAND-NAND circuit is equivalent to which of the following circuit types?

  1. AND-AND
  2. OR-OR
  3. AND-OR
  4. OR-AND
  5. NOR-NOR

3 is CORRECT. The NAND-NAND circuit (a level of NAND gates feeding a single NAND gate) is equivalent to the AND-OR circuit, and can produce Boolean functions in SOP form. Please review the other two-level circuits which are possible, described in the incorrect answers.

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