单项选择题

A. Use a separate table for each date.  Delete eachtable when it is one week old.
B. Use a separate table for each week.  Delete each table when it is one week old.
C. Use a single table, partitioned by date.  Use Entity Group Transactions to delete data when it is one week old.
D. Use a single table, partitioned by week.  Use Entity Group Transactions to delete data when it is one week old.