Question: What type of integrity algorithm and ciphering algorithm are used when an unauthenticated UE establishes an IMS Emergency Session with the AMF, given that there is no shared 5G NAS security context between them?
Option 1: NULL integrity algorithm NIA0 and NULL ciphering algorithm NEA0
Option 2: Standard integrity algorithm NIA1 and standard ciphering algorithm NEA1
Option 3: UE-specific integrity algorithm and AMF-specific ciphering algorithm
Option 4: Session-based integrity algorithm and session-based ciphering algorithm
Explanation: Since the UE and the AMF do not share a complete 5G NAS security context due to lack of primary authentication, they must use NULL algorithms for integrity (NIA0) and ciphering (NEA0) to allow unauthenticated IMS Emergency Sessions.