You support a customer whose network environment that includes Microsoft Lync Server 2013.
The internal web farm fully qualified domain name (FQDN) is webcon.contoso.com. You implement split DNS. Publicly issued certificates are used on the Front End servers and the Edge servers. You need to ensure that Lync users are able to log in by using the Lync 2013 Windows Store app.
What should you do?
A. In the External Access Policy for each user, allow federation.
B. Run the Set-CsPushNotificationConfiguration -EnableMicrosoftPushNotificationService $true cmdlet.
C. In DNS, enter a CNAME for lyncdiscoverinternal.contoso.com that redirects to an address of webcon.contoso.com.
D. In DNS, enter the Service Location (SRV) record _sipinternaltls._tcp.contoso.com and the serving host ofsip.contoso.com.
