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You want to analyze a SQL Tuning Set (STS) using SQL Performance Analyzer in a test database. Which two statements are true regarding the activities performed during the test execution of SQLs in a SQL Tuning Set?（）
A:Every SQL statement in the STS is considered only once for execution
B:The SQL statements in the STS are executed concurrently to produce the execution plan and execution statistics
C:The execution plan and execution statistics are computed for each SQL statement in the STS
D:The effects of DDL and DML are considered to produce the execution plan and execution statistics

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出自：Oracle认证

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