Question: In an IMS network, when an I/S-CSCF is making throttling decisions, which procedure is typically given higher prioritization to prevent interruption of a registered service for a user?
Option 1: Deregistration Request
Option 2: Location Information Request (LIR) for registration services
Option 3: Multimedia Priority Service (MPS) User Authentication
Option 4: Server-Assigned Resource (SAR) commands related to a registered user's active service
Explanation: In the context of message prioritization in IMS, SAR commands associated with an already registered user's ongoing service are given higher priority, ensuring uninterrupted service delivery for the user, a critical consideration during I/S-CSCF throttling decisions.