（单选题）
Which of these appropriately describes the results of a manual SQL Tuning Advisor task？（）
A A list of SQL statements and recommendations for tuning
B A list of SQL statements that have been tuned by the Advisor，with before and after metrics
C Graphs showing the actual performance improvement made by the Advisor after it implemented the recommended changes
D All of the above
正确答案
答案解析
略
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