Question: In the context of EPS AAA interfaces, what is the primary purpose of the `Server-Assignment-Type` AVP value `RESTORATION (14)`?
Option 1: To retrieve non-3GPP user profile data from the HSS for a UE's initial attachment.
Option 2: To store registration and dynamic data in the HSS that may have been lost after a network element restart event.
Option 3: To update the MME with the current PDN-GW Identity during a UE's handover procedure.
Option 4: To request a server update for AAA user data synchronization between 3GPP and non-3GPP networks.
Explanation: The `RESTORATION (14)` value is specifically used to recover from potential data loss after a restart event by storing registration and dynamic data in the Home Subscriber Server (HSS), ensuring continuity of service for affected users.