You have an Exchange Server 2010 server named Server1.Server1 hosts a mailbox database named DB1 that contains 25 user mailboxes.You create a new public folder database named PUB2.You need to configure PUB2 as the default public folder database for each mailbox on DB1.<br /> Which properties should you modify?()
A、Modify the properties of each mailbox.
B、Modify the properties of DB1.
C、Modify the properties of Server1.
D、Modify the properties of PUB2.