You have an Exchange 2010 SP1 organization, with servers in the following configuration:
Server1 – Mailbox, Hub Transport server.
Server2 – Client Access server.
Server1 holds the public folder database.
You deploy a new server named Server4 and Outlook 2010 clients.
Which command would you use to ensure that all new public folders are created only on
Server4?

A.
Set-MailboxDatabase.

B.
Remove-StoreMailbox.

C.
Get-MailboxDatabase.

D.
New-MailboxDatabase.

Explanation:
Set-MailboxDatabase -Identity “Mailbox Database” -PublicFolderDatabase
“PublicFolderDB1”

http://technet.microsoft.com/en-us/library/bb629522.aspx