Question: In a 3GPP PCC context, when a User Equipment (UE) initiates an IP CAN bearer modification, which value of the Bearer-Operation AVP should be used to indicate this event?
Option 1: TERMINATION (0) - Indicating the bearer is being shut down.
Option 2: ESTABLISHMENT (1) - Signifying a new bearer setup by the UE.
Option 3: RESERVED (3) - A value not defined for common bearer operations.
Option 4: MODIFICATION (2) - Indicating changes to an existing bearer.
Explanation: When the UE initiates a modification to an existing IP CAN bearer, the PCC rules need to reflect this change. The Bearer-Operation AVP with a value of MODIFICATION (2) is specifically defined for such scenarios, ensuring the PCC system updates its rules accordingly to manage the modified bearer efficiently.