Question: What is the purpose of the "ERAB.RelFailNbr.Cause" measurement in E-UTRAN performance management?
Option 1: To measure the number of successful E-RAB releases.
Option 2: To calculate the packet loss ratio in the EPS network.
Option 3: To provide the number of E-RAB failed to release, split into subcounters per failure cause.
Option 4: To determine the coverage area for circuit-switched traffic.
Explanation: The "ERAB.RelFailNbr.Cause" measurement is used to count the number of E-RABs that failed to release, with each failure cause accounted for separately. This information can be useful in troubleshooting and optimizing network performance, particularly in relation to EPS coverage area determination.