in your database instance， the STATISTICS_LEVEL initialization parameter is set to BASIC.  What is the impactof this setting（）

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