Question: What is the primary purpose of the WUS assistance information information element in the NAS protocol for Evolved Packet System (EPS)?
Option 1: To determine the WUS group used when paging the UE.
Option 2: To transfer the required authentication information to the UE.
Option 3: To establish a secure connection between the UE and the network.
Option 4: To manage the quality of service for the UE's data transmission.
Explanation: The WUS assistance information element is used to transfer the required assistance information to determine the WUS group used when paging the UE, as stated in the provided text. This highlights its role in efficient paging and resource allocation in telecom networks.