Question: What factors can influence the transport level packet marking by the P-GW in the uplink, according to operator policy?
Option 1: Only the QCI of the associated EPS bearer
Option 2: Only the ARP priority level of the associated EPS bearer
Option 3: Both the QCI and optionally the ARP priority level of the associated EPS bearer
Option 4: Neither the QCI nor the ARP priority level of the associated EPS bearer
Explanation: The correct answer is Option 3 because, according to the text, the transport level packet marking by the P-GW in the uplink may be based on both the QCI and optionally the ARP priority level of the associated EPS bearer, as determined by operator policy. This highlights the importance of considering multiple factors when making decisions about packet marking in telecom networks.