Question: What does the QoS-Negotiation AVP value of `QoS_NEGOTIATION_SUPPORTED (1)` imply for a single PCC rule request in a 3GPP-GPRS Access Type scenario?
Option 1: It mandates the PCRF to authorize the exact requested QoS, disallowing any alterations.
Option 2: It allows the PCRF to negotiate and supply an authorized QoS different from the requested QoS in its response.
Option 3: It indicates that QoS negotiation is only permissible for subsequent PCC rule requests, not the current one.
Option 4: It signifies that the requested QoS will always be authorized without potential changes by the PCRF.
Explanation: The correct answer, `QoS_NEGOTIATION_SUPPORTED (1)`, indicates that for a single PCC rule request, the Policy and Charging Rules Function (PCRF) has flexibility to negotiate Quality of Service (QoS), responding with an authorized QoS that may differ from the original request, allowing dynamic adjustments based on network conditions or policy.