单选题You upgraded Oracle Database 10g to Oracle Database 11g. How would this affect the existing users’ passwords？（）AAll passwords automatically become case-sensitive.BAll passwords remain non-case-sensitive till they are changed.CAll passwords remain non-c

 All passwords automatically become case-sensitive.

 All passwords remain non-case-sensitive till they are changed.

 All passwords remain non-case-sensitive and cannot be changed.

 All passwords remain non-case-sensitive until their password attribute in the profile is altered.