You need to ensure that users can access the Web Application by using the following URLs:

You have a SharePoint Server 2010 server farm that contains the servers shown in the following
table.

You create a Web Application that uses port 80. The Web Application uses Windows authentication
and is accessed by using the URL http://server1. You need to ensure that users can access the Web
Application by using the following URLs: http://server1 and Windows authentication,
https://server1.contoso.com and anonymous authentication. What should you add?

A.
a host header

B.
a new authentication provider

C.
a new zone

D.
an internal URL to the Alternate Access Mappings settings

Explanation:
BURGOS MNEMO: “Alternate Access Mappings settings”