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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

　　Option B is incorrect because the manual SQL Tuning Advisor task does not tune the SQL statements.C is incorrect for the same reason.
　　SQL 優化指導：分析各個 SQL 語句, 並建議 SQL 概要文件, 統計信息, 索引和重構的 SQL 以改善 SQL性能