Which two URLs may NOT be changed?

You are the Office 365 administrator for your company.
The company uses Microsoft Lync Online and wants to customize Lync meeting invitations.
You need to identify the URLs that may NOT be changed on the Lync meeting invitations from the
Lync admin center.
Which two URLs may NOT be changed? Each correct answer presents part of the solution.

A.
Help URL

B.
Company URL

C.
Meeting URL

D.
Legal URL

E.
Logo URL

Explanation:
You can customize meeting invitations sent by the Online Meeting Add-in for Lync 2013 by including
the following optional items in the body of the meeting invitation:
* Your organization’s logo
* A Custom Help or Support Link
* Legal disclaimer text
* Custom footer text
Note:
To Customize the Meeting Invitation by using Lync Server Control Panel
1. Open a browser window, and then enter the Admin URL to open the Lync Server Control Panel.
2. In the left navigation bar, click Conferencing and then click Meeting Configuration.
3. On the Meeting Configuration page, click New..
4. Do any of the following:
• In the Logo URL field, type the URL for your organization’s logo image.
• In the Help URL field, type the URL to your organization’s help or support site.
• In the Legal text field, type the URL to the legal text or disclaimer that you want to include in
meeting invitations.
• In the Custom footer text field, type footer text, up to 2 KB.
Etc.

Configuring the meeting invitation in Lync Server 2013

https://technet.microsoft.com/en-us/library/gg398638(v=ocs.15).aspx