After the UE in the 6G network is turned on and enters the idle state, what operations will be performed in the Attach process? (Multiple choice)

After the UE in the 6G network is turned on and enters the idle state, what operations will be performed in the Attach process? (Multiple choice)
A . Establish the same mobility context between the UE and the core network
B . Through the EPS ATTACH process, the UE can also obtain the IP address assigned by the network
C . Establish the default bearer between the UE and the core network
D . Listen to the network to obtain downlink synchronization

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Answer: ABC