Which external DNS SRV record is needed to facilitate service discovery so that the Cisco Jabber client can automatically find the appropriate servers to connect to while off-net?

Assume that your customer domain is customer.com. Which external DNS SRV record is needed to facilitate service discovery so that the Cisco Jabber client can automatically find the appropriate servers to connect to while off-net?
A. _cisco-uds_tcp customer.com
B. _cuplogin_tcp customer.com
C. _collab-edge_tls customer.com
D. _cisco-uds_tls customer.com
E. _collab-edge_tcp customer.com