Question: For a User Equipment (UE) to support RRC Connection Re-establishment for the Control Plane CIoT EPS Optimization, which of the following conditions must be met?
Option 1: The UE must support at least one LTE TDD band.
Option 2: The UE must support any ue-Category-NB (Narrowband) category.
Option 3: The UE must have a minimum of two transmit antennas.
Option 4: The UE must be capable of carrier aggregation.
Explanation: According to the specifications, RRC Connection Re-establishment for the Control Plane CIoT EPS Optimization is only applicable if the User Equipment (UE) supports any ue-Category-NB. This indicates that Narrowband capabilities are a prerequisite for this feature, highlighting its relevance in low-bandwidth IoT applications where efficiency and reliability of re-establishing connections are crucial.