Question: What is the primary purpose of storing the eFRNid (Relay Node identifier) in the USIM-RN, according to 3GPP specifications?
Option 1: To enable direct communication between the Relay Node and external networks.
Option 2: For frequent retrieval by the UICC-RN interface for operational decisions.
Option 3: As a storage location for Over-The-Air (OTA) update purposes, indicating the bound Relay Node.
Option 4: To authenticate the USIM-RN with the core network during initial attachment.
Explanation: The correct answer is Option 3 because the eFRNid content serves primarily as a storage location for the Relay Node identifier to which the UICC is bound, specifically highlighted for the purpose of Over-The-Air updates. This indicates that its primary function is not for real-time operational decisions or authentication with the core network, but rather for update management.