In digital logic, which gate outputs a high only when both inputs are true?

In digital logic, which gate outputs a high only when both inputs are true?

• A. Or Gate
• B. Nand Gate
• C. Not Gate
• D. And Gate

Answer: (D)

Conjunction of two inputs determines the output. The gate that outputs a high only when both inputs are true is the AND gate. It behaves so that the output is 1 only when both inputs are 1; for all other input combinations the output is 0. This matches the idea that both conditions must be met for the result to be true. For reference, OR would output 1 if either input is 1, NOT inverts a single input, and NAND is the inverse of AND (output is 0 only when both inputs are 1).

Conjunction of two inputs determines the output. The gate that outputs a high only when both inputs are true is the AND gate. It behaves so that the output is 1 only when both inputs are 1; for all other input combinations the output is 0. This matches the idea that both conditions must be met for the result to be true. For reference, OR would output 1 if either input is 1, NOT inverts a single input, and NAND is the inverse of AND (output is 0 only when both inputs are 1).