Question: During the NB-IoT attachment process, as specified for USIM application testing, what is the expected response from the terminal after receiving a successful registration signal?
Option 1: The terminal shall send a new AttachRequest to the NB-SS.
Option 2: The terminal shall respond with an AttachComplete message during registration.
Option 3: The UE shall initiate a RRCConnectionReconfiguration-NB procedure.
Option 4: The USIM shall update its stored TAI without notifying the NB-SS.
Explanation: This question assesses understanding of the attachment process in NB-IoT, specifically the terminal's response after successful registration. The terminal's expected action is to respond with an AttachComplete message, confirming the completion of the attachment procedure, ensuring both the network and the device are synchronized regarding the attachment status.