What would have caused the statistics to be removed?

Initially, for the Automatic Workload Repository (AWR) statistics, the retention period is set
to 7 days, the collection interval is set to 30 minutes and the collection level is set to Typical
in your production database. You have been using the Memory Advisor for the last three
months to generate recommendations for tuning memory components. However, when you
observe the Memory Advisor on a Friday, you find that the statistics are available only for
two days, Thursday and Friday, of that week. What would have caused the statistics to be
removed?

A.
On Wednesday, the retention period has been set to one day.

B.
On Wednesday, the retention period has been set to two days.

C.
On Wednesday, the collection level has been changed to All.

D.
On Wednesday, the collection interval has been set to zero.

E.
On Wednesday, the retention period has been set to zero.

F.
On Wednesday, the statistics have been purged.

G.
On Wednesday, the collection level has been changed to Typical.