What is readout error?

Question: What is readout error? A) An error caused by drawing a circuit incorrectly B) An error where the final measured classical value is reported incorrectly C) An error caused by using too many comments in code D) An error that only occurs before any gate is applied Correct: B Explanation: Readout error occurs during measurement when the actual qubit state is incorrectly reported as the wrong classical bit value. Topic: quantum computing / noise / readout error