Question: Which of the following scenarios triggers a UE in RRC_CONNECTED or RRC_INACTIVE during SDT to initiate the UL information transfer procedure?
Option 1: When there is a need to transfer S1-C related information.
Option 2: When there is a need to transfer NAS dedicated information.
Option 3: When F1-C related information has to be transferred and SRB1 is established.
Option 4: When the UE needs to send a periodic buffer status report.
Explanation: According to the 3GPP specification, a UE in RRC_CONNECTED or RRC_INACTIVE during SDT initiates the UL information transfer procedure whenever there is a need to transfer NAS dedicated information. This highlights the importance of NAS dedicated information in triggering the UL information transfer procedure in specific RRC states.