Which of the following expresses the condition for the output of an AND gate to be true?

The condition for the output of an AND gate to be true is that all inputs must be true. This is the fundamental principle behind how an AND gate operates in digital logic. In an AND gate, the output is only true (or high) when every input fed into it is true (or high). If even one input is false (or low), the output will also be false. This binary operation is critical in logic circuits where specific combinations of conditions must be met for a desired output.

Understanding the function of an AND gate is crucial in fields such as computer science and electronics, where it forms the basis of many logical operations and decision-making processes.