Your company has a Skype for Business Server 2015 infrastructure that contains two topology sites named London and Seatt

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Your company has a Skype for Business Server 2015 infrastructure that contains two topology sites named London and Seattle. Each site contains an Enterprise
Edition Front End pool and an Edge Server.
The external DNS records are configured as shown in the following table:

All users use the Skype for Business client. Some of the users use the Skype for Business client from non-domain joined computers.
You need to ensure that the users in the London site use the Edge Server in the London for authentication and the users in the Seattle site use the Edge Server in the Seattle site for authentication. The solution must minimize administrative effort.
What should you do?

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A. Create an A record for lyncdiscover.contoso.com that points to the reverse proxy in the Seattle site.
B. Create an SRV record named _sipexternal._tls.contoso.com that points to sip2.contoso.com.
C. Create an SRV record named _sip._tls.contoso.com that points to sip2.contoso.com.
D. Configure a Group Policy object (GPO) for the London site that configures the Skype for Business client to use an external server name of sip2.contoso.com.