Question: What is the primary mechanism used to deliver Non-IP data in CIoT EPS Optimisations when the Reliable Data Service is not utilized?
Option 1: Using a Point-to-MultiPoint (PtMP) SGi tunnel
Option 2: Delivery using SCEF or a Point-to-Point (PtP) SGi tunnel, but with no guarantee of in-sequence delivery and potential data loss
Option 3: Dedicated bearers for Non-IP data
Option 4: Broadcast/multicast mechanisms over IP protocol
Explanation: In CIoT EPS Optimisations, when the Reliable Data Service is not used, Non-IP data delivery to SCS/AS can be accomplished by either SCEF or a PtP SGi tunnel. However, this does not guarantee in-sequence delivery and may result in data loss, requiring higher protocol layers to ensure guaranteed delivery if needed.