（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？（）
ASave the baseline in the database
BSave the baseline in the Database Control Home Page
CCreate a procedure to read and apply the baseline to disk I/O metrics
DApply the baseline to the disk I/O metrics in the Mange Metrics page
EAlter the disk I/O metrics to include baseline by using the ALTER METRICScommnd
正确答案
答案解析
略
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