单项选择题

The warning and critical threshold values have been set to 85% and 97%， respectively， for one of the tablespaces. The current tablespace space usage is 54%. You modify the warning threshold to be 50% and critical threshold to be 53% in Database Control. Which statement is true？（）

A.The new setting would be applied but no alerts would be raised immediately.
B.The new setting would be applied and an alert would be raised immediately.
C.The new setting would be ignored because the tablespace space usage is more than the specified threshold value.
D.The new setting would cause an error because the tablespace space usage is more than the specified threshold value.

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