Which two actions should be taken to troubleshoot this problem?

After an administrator installs the Cisco jabber Client, it fails to register with the cisco UCM server.

Which two actions should be taken to troubleshoot this problem? (Choose two.)
A . Verify the installation of the LMHOST file on the PC
B . Verify the configuration of the DNS SRV record.
C . Verify corporate firewall settings for client connections.
D . Verify Layer 3 connectivity on the gateway.
E . Reboot the Cisco Unified Border Element Gateway.

Answer: B,C