Question: What is the primary factor that determines the SSC mode selection by the SMF for a PDU Session?
Option 1: The allowed SSC modes in the user subscription and the PDU Session type.
Option 2: The SSC mode requested by the UE and the operator's provisioned SSCMSP policy.
Option 3: The UE Local Configuration and the default SSC mode per DNN per S-NSSAI.
Option 4: The SMF's local configuration and the cause value of the PDU Session Establishment Request message.
Explanation: According to the text, the SMF selects the SSC mode based on the allowed SSC modes in the user subscription as well as the PDU Session type. This is the primary factor that determines the SSC mode selection by the SMF for a PDU Session.