Which node should you perform the modification?

HOTSPOT
You need to modify the FQDN of the external web services. From which node should you perform the modification?
To answer, select the appropriate node in the answer area.
Hot Area:

Correct Answer:

Explanation/Reference:
Configure Web Services
Log on to the computer where Topology Builder is installed as a member of the Domain Admins group and the RTCUniversalServerAdmins group.
Start Topology Builder: Click Start, click All Programs, click Microsoft Lync Server 2013, and then click Lync Server Topology Builder.
In Topology Builder, in the console tree under Standard Edition Front End Servers, Enterprise Edition Front End pools, and Directory pools, select the pool name. Right-click the name, click Edit Properties, and then click Web Services.
Add or edit the External Web Services FQDN, and then click OK.