You are the Office 365 administrator for your company. You prepare to install Active Directory Federation Services (AD FS).
You need to open the correct port between the AD FS proxy server and the AD FS federation server.
Which port should you open?

A.
TCP 80

B.
TCP 135

C.
TCP 389

D.
TCP 443

E.
TCP 636

F.
TCP 1723

Explanation:

http://blogs.technet.com/b/askds/archive/2012/01/05/understanding-the-ad-fs-2-0-proxy.aspx