After you install Cisco Jabber client, it fails to register with the CUCM server.
Which two actions must you take to troubleshoot the problem?

A.	verify that the name of the configuration file is correct
B.	verify Layer 3 connectivity on the gateway
C.	verify that the corporate firewall allows connections TO and FROM Jabber client
D.	verify that the LMHOST files is installed on the PC
E.	reboot CUBE gateway