Which two SRV records are valid for a SIP and H.323 communication?

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An organization with a domain name of example.com.

Which two SRV records are valid for a SIP and H.323 communication? (Choose two.)
A . _sips._tcp.example.com
B . _sips._udp.example.com
C . _h323ls._udp.example com
D . _h323ls._tcp.example.com
E . _collab-edge._tls.example.com

Answer: AC