Answer :It refers to a condition that causes a system to fail.
Definition of Error : One common definition of a software error is a mismatch between the program and its specification. In other words, we can say, a software error is present in a program when the program does not do what its end user expects.
Categories of Software Errors:
User interface errors such as output errors or incorrect user messages.
Incorrect program version
Module interface errors
Logic errors such as calculation errors, State-based behavior errors, Communication errors, Program structure errors, such as control-flow errors.
With this definition of error all the 3 Options can be satisfied which are correct.