Answer:
B) error rate
Explanation:
error rate basically refers to how many mistakes that a user makes while performing a task, the severity of these mistakes are and how easy it is to recover from these mistakes. So error rate is recorded when user makes a mistake while performing a task. The description of the error is also provided with the error. Then the severity of these error is recorded and the error are classified. Â IT is time consuming to record the errors but error rates are useful in providing usability of a task and helps to identify the errors. It also helps to identify the cause of occurrence of an error.
