Question: What is the state of the UE in 5GMM-DEREGISTERED, and what actions can the network take in this state?
Option 1: The UE is registered, and the network can only respond to deregistration procedures.
Option 2: The UE is deregistered, but the network cannot respond to initial registration procedures.
Option 3: The UE has an established 5GMM context, and the network can only respond to de-registration procedures initiated by the UE.
Option 4: The UE is deregistered, and the network may respond to both initial registration procedures and de-registration procedures initiated by the UE.
Explanation: In the state 5GMM-DEREGISTERED, no 5GMM context has been established or the 5GMM context is marked as deregistered. The UE is deregistered, which means it does not have an active registration with the network. However, the network can still respond to initial registration procedures initiated by the UE, allowing the UE to re-register and establish a new 5GMM context. Additionally, the network may also answer to de-registration procedures initiated by the UE, further confirming the UE's deregistered state.