Question: What is the role of Security Edge Protection Proxy (SEPP) in the communication between SNPN and Credentials Holder when using AUSF and UDM for primary authentication?
Option 1: SEPP is used to protect the UE from roaming attacks.
Option 2: SEPP is not required for communication between SNPN and Credentials Holder.
Option 3: SEPP is used to protect the communication between SNPN and Credentials Holder via IPX providers.
Option 4: SEPP is used to authenticate the UE with the UDM.
Explanation: According to clause 5.9.3.2, SEPP is required for protection between SEPPs, which implies that SEPP plays a crucial role in securing the communication between SNPN and Credentials Holder when using AUSF and UDM for primary authentication.