Question: What is the purpose of the measurement "ERAB.ModQoSAttNbr.QCI" in the context of Evolved Universal Terrestrial Radio Access Network (E-UTRAN)?
Option 1: To measure the number of E-RABs successfully modified with a new QoS parameter.
Option 2: To count the total number of E-RABs established in the network.
Option 3: To provide the number of E-RABs attempted to modify the QoS parameter, split into subcounters per E-RAB QoS level (QCI).
Option 4: To measure the average throughput of packet switched traffic in the network.
Explanation: The correct answer is Option 3 because the measurement "ERAB.ModQoSAttNbr.QCI" is specifically designed to count the number of E-RABs attempted to modify the QoS parameter, with subcounters for each QCI level. This allows network operators to monitor and analyze the performance of their network in terms of QoS modifications.