In your database，the STATISTICS_LEVEL initialization parameter is set to BASIC. What is the impact of this setting？（）

• A、The optimizer statistics are collected automatically.
• B、Only the timed operating system （OS） statistics and plan execution statistics are collected.
• C、The Oracle server dynamically generates the necessary statistics on tables as part of query optimization.
• D、The snapshots for the Automatic Workload Repository （AWR） are not generated automatically. 
• E、Snapshots cannot be collected manually by using DBMS_WORKLOAD_REPOSITORY PACKAGE.