【单选题】
You work as a database administrator for Supportcenter.cn. You want to be notified when the number of disk I/O increases by 10% of what it was yesterday. You create a baseline metric for yesterday’s disk I/O performance. How do you use the baseline metrics to achieve your objective？（）
A、Save the baseline in the database
B、Save the baseline in the Database Control Home Page
C、Create a procedure to read and apply the baseline to disk I/O metrics
D、Apply the baseline to the disk I/O metrics in the Mange Metrics page
E、Alter the disk I/O metrics to include baseline by using the ALTER METRICScommnd
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