Question: What is the behavior of NR regarding the delivery of NAS messages over SRBs in RRC, except at handover?
Option 1: NR provides unreliable out-of-sequence delivery of NAS messages.
Option 2: NR provides reliable in-sequence delivery of NAS messages.
Option 3: NR does not guarantee any specific order or reliability for the delivery of NAS messages.
Option 4: NR only guarantees the integrity protection and ciphering of NAS messages.
Explanation: The correct answer is Option 2 because, according to the text, NR provides reliable in-sequence delivery of NAS messages over SRBs in RRC, except at handover where losses or duplication can occur when PDCP is re-established. This highlights the importance of maintaining sequence and reliability for NAS message delivery in the context of telecom networks.