Question: What mechanism is used for Non-IP data delivery to the network handling Non-IP data services in the context of CIoT EPS optimisations?
Option 1: Delivery using only SCEF
Option 2: Delivery using only a Point-to-Point (PtP) SGi tunnel
Option 3: Delivery using either SCEF or a Point-to-Point (PtP) SGi tunnel
Option 4: Delivery using both SCEF and a Point-to-Point (PtP) SGi tunnel simultaneously
Explanation: The correct answer is Option 3 because the text states that Non-IP data delivery to the network handling Non-IP data services is accomplished by one of two mechanisms: Delivery using SCEF or Delivery using a Point-to-Point (PtP) SGi tunnel. This indicates that either mechanism can be used, but not necessarily both simultaneously.