Scenario:

A Citrix Administrator is upgrading a server from XenApp 6.5 to XenDesktop 7.6 LTSR. During the
installation, the Virtual Delivery Agent (VDA) failed to install. Upon investigation, the administrator
determines that Microsoft Internet Information Services (IIS) is using the same port as the Citrix
XML Service. What is the cause of the failure?

A.
The XenApp server still has a localhost cache.

B.
The License Server has NOT been upgraded.

C.
Microsoft RDS logons were set to disabled.

D.
The previous installation was a Controller.