Which of the following scenarios will release the NAS signaling connection after the TAU is completed?

Which of the following scenarios will release the NAS signaling connection after the TAU is completed?
A . TAU initiated in IDLE state, Active flag=1
B . TAU initiated under CONNECTED, Active flag=0
C . TAU initiated under CONNECTED, Active flag=1
D . TAU initiated in the IDLE state, Active flag=0

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Answer: D