Which of the following application scenarios that belong to the change configuration method? (Multiple choice)
A . In the upgrade and expansion, if you suspect that the new configuration is faulty, you can re-issue the original configuration to locate the configuration problem.
B . If you suspect that there is a problem with a slot, you can exclude it by changing the board configuration.
C . If you suspect that there are problems with certain channels or one of the tributary boards of the tributary board, you can change the time barrier configuration to configure the service to another channel or to another tributary board.
D . If you suspect that there is a problem with one VC-4, you can adjust the time barrier to another VC-4.
Answer: ABCD
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