You need to recommend changes to the DNS zone that meet the company’s compliance requirements. What records should you include in the recommendation?

A.
_sipfederationtcp._tls.litwareinc.com and _tls._sip.litwareinc.com

B.
_sipfederationtls._udp.litwareinc.com and _sip.litwareinc.com

C.
_sipfederationssl._tcp.litwareinc.com and _sip._ssl.litwareinc.com

D.
_sipfederationtls._tcp.litwareinc.com and _sip._tls.litwareinc.com

Explanation:
_sip._tls. record is required for client autoconfiguration, and _sipfederationtls._tcp. is required for federation. All other records are meaningless. (http://technet.microsoft.com/en-us/library/gg398758.aspx)