[单选题]You find today’s performance of your production da

Acreate baseline metrics for today’s performance

Bwrite the current database metrics to a database table and create a trigger to compare with future database statistics

Cwrite the current database metrics to a flat file and create an operating script to compare with future database statistics

Dwrite the current database metrics to a database table and create a procedure to compare with future database statistics

Ewrite the current database metrics to a database table and submit a job using DBMS_JOB to compare with future database statistics