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The correct answer is B.

OBJ-3.1: The severity levels range from zero to seven, with zero being the most severe and seven being the least severe. Level 0 is used for an emergency and is considered the most severe condition because the system has become unstable. Level 1 is used for an alert condition and means that there is a condition that should be corrected immediately. Level 2 is used for a critical condition, and it means that there is a failure in the system’s primary application and it requires immediate attention. Level 3 is used for an error condition, and it means that something is happening to the system that is preventing the proper function. Level 4 is used for warning conditions and it may indicate that an error will occur if action is not taken soon. Level 5 is used for notice conditions and it means that the events are unusual, but they are not error conditions. Level 6 is used for information conditions and it is a normal operational message that requires no action. Level 7 is used for debugging conditions and is just information that is useful to developers as they are debugging their networks and applications.

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