Question: What is the primary purpose of the reference point Zh in the Generic Authentication Architecture (GAA) between the Bootstrapping Server Function (BSF) and the Home Subscriber Server (HSS)?
Option 1: To facilitate inter-operator roaming authentication
Option 2: To manage Quality of Service (QoS) parameters for GBA-enabled services
Option 3: To retrieve authentication information and GBA user security settings from the HSS to the BSF
Option 4: To enable direct communication between User Equipment (UE) and the BSF for bootstrapping
Explanation: The reference point Zh is specifically defined for the BSF to fetch necessary authentication information and all GBA user security settings from the HSS, crucial for the bootstrapping process within the same operator domain. This ensures secure and authorized access to services.