Question: In an SNPN-deployed IMS scenario where the SNPN and ISH share the same administrative domain, what authentication/authorization method(s) can be utilized for a UE to access IMS services?
Option 1: Only USIM (Universal Subscriber Identity Module)
Option 2: Only IMC (IP Multimedia Card) or external SIM
Option 3: Either USIM or ISIM (IP Multimedia Subscriber Identity Module), but not IMC
Option 4: Either USIM/ISIM or IMC (IP Multimedia Card)
Explanation: In the context of an SNPN-deployed IMS where the SNPN and ISH are within the same administrative domain, flexibility in authentication and authorization methods is crucial for accommodating various UE configurations. Both USIM/ISIM, typically used in traditional mobile networks for subscriber identity, and IMC, which might be utilized in more specialized or non-traditional access scenarios, can serve as valid means to authenticate and authorize UEs for IMS services. Thus, the correct answer reflects this dual capability.