Question: In a CAMEL service invocation, what does the `qualityOfService` parameter contain when the InitialDPGPRS operation is triggered by a 'PDP Context Establishment Acknowledgement' TDP?
Option 1: Only Requested QoS
Option 2: Only Subscribed QoS and Negotiated QoS
Option 3: Requested QoS, Subscribed QoS, but not Negotiated QoS
Option 4: Requested QoS, Subscribed QoS, and Negotiated QoS
Explanation: When the InitialDPGPRS operation is sent as a result of a 'PDP Context Establishment Acknowledgement' TDP, the `qualityOfService` parameter must contain all three: the Requested QoS (reflecting the user's request), the Subscribed QoS (as per the user's subscription), and the Negotiated QoS (the actual QoS agreed upon during the establishment process).