Which server should be the target of the Web publishing rule?

Your network has a Lync Server 2010 infrastructure that contains five servers.
The servers are configured as shown in the following table.

The network contains a server named TMG1 that runs Microsoft Forefront Threat Management Gateway (TMG) 2010.
You plan to create a Web publishing rule on TMG1.
You need to ensure that all remote users can connect to the simple URLs.
Which server should be the target of the Web publishing rule?

A.
Server1

B.
Server3

C.
Server4

D.
Server5

Explanation:
http://www.agileit.com/Blog/Lists/Posts/Post.aspx?ID=792

The simple URLs can be handled by a dedicated web publishing rule, or you can add it to the public names of the web publishing rule for the Director.