Question: Which of the following RRC functions is NOT applicable to Narrowband Internet of Things (NB-IoT) devices?
Option 1: Establishment/modification/release of Radio Bearers (RBs) carrying user data (DRBs)
Option 2: Measurement configuration and reporting, including intra-frequency, inter-frequency, and inter-RAT measurements
Option 3: Initial security activation, i.e., initial configuration of Access Stratum (AS) integrity protection and AS ciphering for SRBs and DRBs
Option 4: Paging and RRC connection control, including establishment/modification/suspension/resumption/release of RRC connection
Explanation: Measurement configuration and reporting is not applicable for NB-IoT, highlighting a key distinction in managing NB-IoT devices, reflecting their specialized nature for low-bandwidth, machine-type communications.