The chain of events in the correct sequence is A because:
Error: An error is a human action or decision that produces an incorrect or unexpected result.
Fault: A fault is a defect or deviation in the software that can cause it to behave incorrectly.
Failure: A failure is an incorrect behavior of the software that deviates from its expected behavior and causes it to produce incorrect or unexpected results.
So, the sequence of events is: An error (made by a developer) leads to a fault (a defect in the code) which eventually leads to a failure (the incorrect behavior of the software).
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