Your network contains an FTP server that runs Windows Server 2008 R2.
You create an FTP site on the server and allow Read access for all users.
You create an IIS Manager user account for a user named User1.

You need to ensure that User1 can connect to the FTP site.

What should you do?

A.
Enable FTP user isolation.

B.
Enable Basic authentication.

C.
Add an FTP authorization rule.

D.
Add a custom provider for FTP authentication.

Explanation:

IIS Manager Authentication
IIS Manager authentication is a custom authentication method that requires users to provide a valid IIS Manager user name and password to gain access to content. IIS Manager authentication requires that the IIS Management Service is installed and configured to use both Windows credentials and IIS Manager credentials. (The IIS Management Service does not have to be running when you use IIS Manager authentication.)
Source: http://technet.microsoft.com/en-us/library/dd722688.aspx