Answer: NOT + AND.
- A AND gate only
- B NOT + AND
- C NOT + OR
- D OR + AND
Correct answer: B. NOT + AND
Explanation: NAND = NOT + AND. Output is 0 only when all inputs are 1; otherwise output is 1.
Conductors have overlapping bands, semiconductors have a small energy gap that can be bridged by heat or doping, and insulators have a large gap that blocks conduction.
Concept context
Band theory, p-n junction, diodes, transistors, logic gates, and integrated circuits.