Question: In a 5G roaming scenario, what is the primary identifier used by the Network Slice within a Public Land Mobile Network (PLMN) for charging purposes?
Option 1: S-NSSAI (Single Network Slice Selection Assistance Information)
Option 2: IMSI (International Mobile Subscriber Identity)
Option 3: MSISDN (Mobile Station International Subscriber Directory Number)
Option 4: GUTI (Globally Unique Temporary Identifier)
Explanation: In a 5G roaming scenario, the S-NSSAI is used to identify the Network Slice within a PLMN for charging purposes. This allows the Home Public Land Mobile Network (HPLMN) and Visited Public Land Mobile Network (VPLMN) to collect charging information for retail and wholesale billing, respectively.