问题：

[单选] You work as a network exchange administrator at company.com.the company.com network currently consists of a single active directory forest containing a single domain named company.com.the company.com organization makes use of microsoft exchange server 2010 as their messaging solution.thecompany.com organization currently makes use of a computer named -ex01.during the course of the business week you receive instruction from company.com to configure a retention period of 30 days for all deleted message items whilst ensuring that each item which passes the retention period are removed between 3：00 and 5：00 on a daily basis. What should you do？（）

A . you should consider having the maintenance schedule of king database changed for the retention and removal of message items.
B . you should consider having the messaging record management （mrm） schedule for-ex01 changed for the retention and removal of message items.
C . you should consider having the set-retention policy cmdlet run to schedule the retention and removal of message items.
D . you should consider having the start-managed folder assistant cmdlet run to schedule the retention and removal of message items.