Question: Under what condition may E-UTRAN initiate retrieval of UE radio access capability information before AS security activation in RRC_CONNECTED state?
Option 1: When the UE is using Control plane CIoT EPS optimisation.
Option 2: For all UEs, regardless of their current security activation status.
Option 3: Only for UEs that have previously provided capability information.
Option 4: Never; AS security activation always precedes capability retrieval.
Explanation: According to the specifications, the exception to retrieving UE capabilities after AS security activation is when the UE is utilizing Control plane CIoT EPS optimisation. In this specific scenario, E-UTRAN may initiate the procedure before AS security activation, highlighting a nuanced handling for IoT optimized connections.