Which DNS record is missing for service discovery of Cisco Unified Communications Manager for the login process to proceed further?

Refer to the exhibit.

Troubleshooting an internal Jabber login issue and you see this logging snippet from the Jabber PRT file. You already checked that the Jabber client has a connection to the correct DNS server.

Which DNS record is missing for service discovery of Cisco Unified Communications Manager for the login process to proceed further?
A . A record for the Cisco Unified Communications Manager
B . SRV record _cisco-uds._tcp.example.com
C . A record _cuplogin._tcp.example.com
D . SRV record _cuplogin._tcp.example.com

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Answer: B