A.Create a separate storage group and database to contain the customer service mailboxes. Enable circular logging for this storage group
B.Create a separate storage group and database to contain the customer service mailboxes. Set the deleted item retention period for this database to zero
C.Place the customer service mailboxes on a new mailbox store in the storage group that contains the main office user mailboxes. Enable circular logging for this storage group
D.Place the customer service mailboxes on a new mailbox store in the storage group that contains the branch office user mailboxes. Set the deleted item retention period for this database to zero

A.Place the mailboxes for each region on a separate server. Create an administrative group for each region. Assign each regional technician Exchange Full Administrator permission over that region’s administrative groups. Assign the main office IT staff Exchange Full Administrator permission over each administrative group.
B.Place the mailboxes for each region on a separate server. Create an administrative group for each region. Assign each regional technician Exchange Full Administrator permission over all administrative groups. Assign the main office IT staff Exchange Full Administrator permission over each administrative group
C.Place the mailboxes from multiple regions on each server. Create an administrative group for each server. Assign each regional technician Exchange Full Administrator permission over the administrative groups that contain servers that hold mailboxes for that region. Assign the main office IT staff Exchange Full Administrator permission over each administrative group
D.Place the mailboxes from multiple regions on each server. Create a single administrative group for all servers. Assign each regional technician and the main office IT Staff Exchange Full Administrator permission over the administrative group