单项选择题

A.TheLDAPdirectorymusthaveasecondaryprofileconfigured.
B.Nospecialconfigurationisrequired.CiscoUnifiedCallManagermaintainsthefailover.
C.TheJTAPIproviderontheCiscoCRSservermustbeconfiguredwiththesecondaryCiscoUnifiedCallManagerIPaddressfollowingtheprimaryCiscoUnifiedCallManagerIPaddress.
D.TheremustbeasecondJTAPIuserconfiguredwithanalternaterangeofCTIports.