Your company has a hybrid deployment of Office 365.
You need to set the authentication method of the federation servers to forms-based authentication.
What should you do?
A.
Modify the Web.config file in the %systemroot%\\inetpub\\adfs\\ls directory.
B.
Modify the Global.asax file in the %systemroot%\\inetpub\\adfs\\ls directory.
C.
From the AD FS 2.0 Management console, add a relaying party trust.
D.
From the AD FS 2.0 Management console, add a claims provider trust.
Explanation:
http://msdn.microsoft.com/en-us/library/xdt4thhy.aspx
Option A is Correct.Authentication can be changed in web.config.
By default AD FS 2.0 Federation Servers use IWA and AD FS 2.0 Federation Server Proxy servers use FBA.
To select a non-default local authentication type, perform the following steps:
1) In Windows Explorer, browse to C:\inetpub\adfs\ls (assuming that inetpub lives in C:\)
2) Select web.config and Edit in Notepad
3) Find (Ctrl+F)
4) There are four lines below . Each line represents one of the local authentication types listed above.
5) Cut your preferred local authentication type (the entire line), and Paste it to the top of the list (under )
6) Save and Close the web.config file
https://social.technet.microsoft.com/wiki/contents/articles/1600.ad-fs-2-0-how-to-change-the-local-authentication-type.aspx