Question: What is the requirement for a UE operating in single-registration mode when both 5GMM and EMM are enabled?
Option 1: The UE shall maintain separate registrations for 5GMM and EMM.
Option 2: The UE shall only use 5GMM for registration.
Option 3: The UE shall maintain one common registration for 5GMM and EMM.
Option 4: The UE shall not register with either 5GMM or EMM.
Explanation: According to the specifications, when both 5GMM and EMM are enabled, a UE operating in single-registration mode is required to maintain one common registration for 5GMM and EMM. This ensures that the UE has a unified registration status across both 5GMM and EMM, which is essential for seamless mobility management in 5G networks.