Question: In a 3GPP-GPRS context, what is the primary function of the Bearer-Identifier AVP when present in a CC-Request Diameter command?
Option 1: To authenticate User Equipment (UE) for network access
Option 2: To specify the bearer to which subsequent AVPs within the command refer
Option 3: To indicate the Quality of Service (QoS) parameters for all bearers in a session
Option 4: To request the establishment of a new IP CAN session
Explanation: The Bearer-Identifier AVP's role is to identify the specific bearer that subsequent Attribute-Value Pairs (AVPs) in the CC-Request Diameter command pertain to, ensuring precise policy and charging control in 3GPP networks. The other options describe unrelated functions: UE authentication, QoS parameter indication for all bearers, and new IP CAN session establishment.