Question: What is the purpose of including the Extended rejected NSSAI Information Element (IE) in a message from the network to the User Equipment (UE)?
Option 1: To inform the UE about the supported S-NSSAIs.
Option 2: To request additional registration information from the UE.
Option 3: To indicate that the UE's requested NSSAI is accepted by the network.
Option 4: To notify the UE of one or more S-NSSAIs that were rejected by the network.
Explanation: The Extended rejected NSSAI IE is used to inform the UE about the S-NSSAIs that were included in the requested NSSAI but were rejected by the network, allowing the UE to take appropriate action.