About the description of the gateway selection in EPC, which of the following are correct? (Multiple Choice)
A . MME select S-GW according to the UE’s current TAI
B . In the process of Attach, select S-GW using the DNS parse function based on TAI
C . Should try to choose the P-GW unity with the selected S-GW
D . If UEA activates multiple PDN connections to a APN, these PDN connections can choose different PGW
Answer: ABC
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