You have an Exchange Server 2010 Service Pack 1 (SP1) organization. You plan to implement a redundancy solution for Exchange dependencies. You need to identify which services must be available for the Exchange organization to function correctly for all users.

Which service or services should you identify? (Choose all that apply.)

A.
certification authority (CA)

B.
DNS server

C.
domain naming master

D.
global catalog

E.
infrastructure master

F.
primary domain controller (PDC) emulator

G.
WINS server