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.