2. The gate function illustrated is an equivalent representation for an

  1. AND gate
  2. OR gate
  3. NAND gate
  4. NOR gate
  5. XOR gate

3 is CORRECT. This is the alternate symbolic form for a NAND gate (2 bubbles attached to the inputs of an OR), which comes from the DeMorgan property 

	NAND: (xy)' = x' + y'
The bubble represents a NOT operation (inversion).

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