The correct answer is C. NAND and NOR gates are universal gates.
A universal gate is a logic gate that can be used to create any other logic gate. NAND and NOR gates are universal gates because they can be used to create AND, OR, and NOT gates.
An AND gate is a logic gate that produces a 1 output only if all of its inputs are 1. An OR gate is a logic gate that produces a 1 output if any of its inputs are 1. A NOT gate is a logic gate that inverts its input.
A NAND gate is a logic gate that produces a 0 output only if all of its inputs are 1. A NOR gate is a logic gate that produces a 0 output if any of its inputs are 1.
NAND and NOR gates are universal gates because they can be used to create any other logic gate. For example, an AND gate can be created by connecting two NAND gates in series. An OR gate can be created by connecting two NOR gates in parallel. A NOT gate can be created by connecting a single NAND gate to itself.
NAND and NOR gates are the simplest logic gates, and they are used in many different types of electronic circuits.