Question: During an inter-Radio Access Technology (RAT) handover from another RAT to NR (New Radio), what action does the network take regarding security as part of the RRCReconfiguration procedure?
Option 1: The network always deactivates ciphering to simplify the handover process.
Option 2: The network never changes the ciphering status, maintaining the source RAT's configuration.
Option 3: The network activates ciphering, possibly using a NULL algorithm, if it was not already activated in the other RAT.
Option 4: The network always switches to a predefined, stronger ciphering algorithm for enhanced security in NR.
Explanation: This is correct because, during an inter-RAT handover to NR, ensuring continuity of security is crucial. Activating ciphering (with the possibility of using a NULL algorithm if necessary) guarantees that data remains protected as the User Equipment (UE) transitions between radio access technologies.