Which user agent should you modify?

HOTSPOT
You upgrade an environment that includes Lync Server 2013 Standard Edition to Skype for Business Server 2015.
An administrator modifies the global client policy. After this modification, users with Lync 2013 clients are unable to sign following error message is displayed:

You need to ensure that users with Lync 2013 clients can sign in.
In the Skype for Business Control Pane, which user agent should you modify? To answer, select the appropriate user agent rule in the answer area.
Hot Area:

Correct Answer:

Explanation/Reference:
Note: Lync has a Client Version Policy that allows you to allow or reject registrations from certain client versions.
Here the Lync server 2013 clients are blocked because they have too new version number.