Question: Which of the following is a mandatory part of the "Base" feature in Fault Management service, as opposed to being an optional additional feature?
Option 1: Setting comments for alarms
Option 2: Clearing alarms by the consumer
Option 3: Alarm notification without correlation
Option 4: Receiving and displaying alarm notifications (AlarmRecord dataType core functionality)
Explanation: The "Base" feature in Fault Management service inherently includes core functionalities necessary for its primary operation. Receiving and displaying alarm notifications, which is essentially the core functionality of the AlarmRecord dataType, would be a fundamental aspect of this base feature. This is because without the ability to receive and display alarms, the fault management system cannot perform its basic function. Options 1, 2, and 3 represent additional functionalities that enhance the base capability but are not essential for its primary operation, aligning with the description of optional features provided in the context.