单选题What is true if you want to switch undo tablespaces from the current one， called UNDO1， to a new one called UNDO2？（）AIt is NOT possible to switch unless no active transaction exist in UNDO1. BIt is possible to switch to UNDO2； but current active transactions will abort. CIt is possible to switch to UNDO2； current active transactions will be automatically migrated to UNDO2. DIt is possible to switch to UNDO2； only current active transactions will continue to execute inside UNDO1.
单选题
What is true if you want to switch undo tablespaces from the current one， called UNDO1， to a new one called UNDO2？（）
A
It is NOT possible to switch unless no active transaction exist in UNDO1.
B
It is possible to switch to UNDO2； but current active transactions will abort.
C
It is possible to switch to UNDO2； current active transactions will be automatically migrated to UNDO2.
D
It is possible to switch to UNDO2； only current active transactions will continue to execute inside UNDO1.
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