Question: What is the primary purpose of the EstablishmentCause-NB Information Element in the RRC protocol of E-UTRA networks?
Option 1: To indicate the reason for initiating an RRC connection request or resume request, as provided by upper layers.
Option 2: To specify the type of service (e.g., voice, data) for an established RRC connection.
Option 3: To report errors encountered during the RRC connection setup process.
Option 4: To negotiate radio resource allocation for ongoing sessions.
Explanation: The EstablishmentCause-NB Information Element conveys the establishment cause (e.g., mobile originated signaling, mobile terminated access) for RRC connection requests or resume requests, based on inputs from upper layers, crucial for network resource management and optimizing connection handling.