Question: What is excluded from the 'Average UL cell PDCP SDU bit-rate' measurement in terms of traffic types?
Option 1: Only retransmissions
Option 2: Both user plane and control signalling traffic
Option 3: Control signalling and retransmissions
Option 4: Successful transmissions of user plane traffic
Explanation: The 'Average UL cell PDCP SDU bit-rate' measurement specifically excludes control signalling and retransmissions, focusing only on successful transmissions of user plane traffic, to accurately assess network performance in terms of effective data transfer rates.