You need to ensure that Web developers can update the Web content on Site1 by using HTTP

Your network contains a Web server that runs Windows Server 2008 R2.
The server has a Web site named Site1.

You need to ensure that Web developers can update the Web content on Site1 by using HTTP.

What should you do first?

A.
Modify the Feature Delegation settings.

B.
Install the ASP Web Server (IIS) role service.

C.
Install the WebDAV Publishing Web Server (IIS) role service.

D.
Modify the Microsoft ASP.NET pages and control settings for the Web site.

Explanation:
About WebDAV

Web Distributed Authoring and Versioning (WebDAV) extends the HTTP/1.1 protocol to allow clients to publish, lock, and manage resources on the Web.
Integrated into IIS, WebDAV allows clients to do the following:
Manipulate resources in a WebDAV publishing directory on your server. For example, users who have been assigned the correct rights can copy and move files around in a WebDAV directory.

Modify properties associated with certain resources. For example, a user can write to and retrieve a file’s property information.

Lock and unlock resources so that multiple users can read a file concurrently. However, only one person can modify the file at a time.

Search the content and properties of files in a WebDAV directory.

Setting up a WebDAV publishing directory on your server is as straightforward as setting up a virtual directory through IIS Manager. After you have set up your publishing directory, users who have been assigned the correct rights can publish documents to the server and manipulate files in the directory.

Source: http://technet.microsoft.com/en-us/library/cc781730.aspx