How can the administrator add a four month retention?

Weekly full backups run for client A on maeter1 using a storage unit that belongs to medial. The administrator is required to retain client A’s full backups for a period of four months. When the administrator modifies the full schedule, an option for 4 months is missing from the Retention drop down list.

How can the administrator add a four month retention?
A . modify an existing retention level in the server host properties, under Retention Periods
B . ignore the selection list and type in the desired retention period directly
C . add a new retention period in the media server host properties, under Retention Periods
D . increase the Image cleanup Interval in the master server host properties, under Clean-up

Answer: D