Question: What is the primary purpose of the "Failed RRC connection establishment per failure cause" measurement in E-UTRAN?
Option 1: To evaluate the performance of the eNodeB's transmission capabilities.
Option 2: To support Load Balancing Optimization (LBO) target setting and evaluation.
Option 3: To measure the number of successful RRC connections established by the UE.
Option 4: To monitor the energy consumption of the eNodeB.
Explanation: The "Failed RRC connection establishment per failure cause" measurement is used to support Load Balancing Optimization (LBO) target setting and evaluation, as stated in the text. This measurement provides insights into the reasons behind failed RRC connections, which can help operators optimize their network configuration and improve overall performance.