Question: Which entity determines whether an NSAC admission request for a roaming UE is accepted or rejected in the HPLMN NSAC Admission Mode?
Option 1: AMF in VPLMN
Option 2: SMF in VPLMN
Option 3: Primary NSACF or central NSACF in VPLMN
Option 4: Primary NSACF or central NSACF in HPLMN
Explanation: In the HPLMN NSAC Admission Mode, the primary NSACF or central NSACF in the Home PLMN (HPLMN) is responsible for determining whether an NSAC admission request for a roaming UE is accepted or rejected. This decision is based on the principles described in clause 5.15.11.2 for home routed PDU sessions.