Why is the user not able to log in?

Refer to the exhibit.

Users connected to the internal network report a “Cannot communicate with the server” error while trying to log in to Cisco Jabber using auto service discovery. The Jabber diagnostics and the SRV record configuration are as shown in the exhibit. The host cucm1.ccnp.cisco.com is correctly resolved by the user desktops with the Cisco Unified Communications Manager IP address. Why is the user not able to log in?
A. SRV protocol is not set up correctly. It should be _tls instead of _tcp.
B. Marking weight as 0 on the SRV record makes it inactive, so Jabber cannot discover the Cisco Unified CM.
C. The port specified on the SRV record is wrong.
D. The domain ccnp.cisco.com does not exist on the DNS server.