After you deploy a cluster with LDAP authentication, you receive multiple reports that users are unable to log in to their phones with EXT MOB. Which two steps must you take to troubleshoot the problem?

A.	Restart the DirSync service in the CUCM PUB
B.	check whether the LDAP configuration requires SSL
C.	check whether the LDAP server is acting as a global catalog server
D.	Check whether CUCM is running
E.	download and install the Sun LDAP connector