Question: What does the `PRE-EMPTION_VULNERABILITY_ENABLED` value of the Pre-emption Vulnerability AVP (AVP code 1048) signify in terms of resource allocation for a service data flow or bearer?
Option 1: It signifies that resources cannot be pre-empted for a higher priority service data flow or bearer.
Option 2: It indicates a neutral state, where pre-emption vulnerability is determined by other AVPs.
Option 3: It signifies that resources assigned can be pre-empted and allocated to a service data flow or bearer with a higher priority level.
Option 4: It is used exclusively for default bearers and not for individual service data flows.
Explanation: The correct answer, `PRE-EMPTION_VULNERABILITY_ENABLED`, indicates that the resources currently allocated to a service data flow or bearer can indeed be taken away (pre-empted) if a new request with a higher priority level comes in. This is crucial for managing network resources efficiently, especially in scenarios where high-priority communications (e.g., emergency services) need to be ensured connectivity over lower-priority ones. Understanding this concept is vital for effective Policy and Charging Control (PCC) in telecommunications networks.