单选题The DBA is defining role for users. Which of the following is not an acceptable method for defining a default role?（）AALTER USER DEFAULT ROLE ALLBALTER USER DEFAULT ROLE ALL EXCEPT ROLE_1CALTER USER DEFAULT ROLE NONEDALTER USER DEFAULT ROLE NONE EXCEPT ROLE_1
单选题
The DBA is defining role for users. Which of the following is not an acceptable method for defining a default role?（）
A
ALTER USER DEFAULT ROLE ALL
B
ALTER USER DEFAULT ROLE ALL EXCEPT ROLE_1
C
ALTER USER DEFAULT ROLE NONE
D
ALTER USER DEFAULT ROLE NONE EXCEPT ROLE_1
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