Question: In a hierarchical architecture, how does a VPLMN primary NSACF handle re-distribution of quota amongst multiple NSACFs?
Option 1: The HPLMN central or primary NSACF is involved in the re-distribution process.
Option 2: The VPLMN primary NSACF handles the re-distribution with no involvement from the HPLMN.
Option 3: The NSACFs in the VPLMN handle the re-distribution autonomously.
Option 4: The UE initiates the re-distribution process.
Explanation: In a hierarchical architecture, if re-distribution of quota is required in the VPLMN amongst multiple NSACFs, this is handled by the primary NSACF in VPLMN with no involvement from the HPLMN. This ensures that the VPLMN has control over the quota re-distribution process and can manage it according to its own policies and principles.