The shown combination (A through single-input NAND, B through single-input NOR, then a NOR) is equivalent to:
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Question

The shown combination (A through single-input NAND, B through single-input NOR, then a NOR) is equivalent to:

G1 Physics · Accepted Answer

A single-input NAND gate acts as NOT, yielding A̅. A single-input NOR gate likewise yields B̅. The final NOR produces Y = NOT(A̅ + B̅). Apply De Morgan: Y = A·B. Final answer: AND gate, Option C.