A SharePoint environment contains a single web application at http://app1. Users access a site collection under the web application by using the URL http://portal.contoso.com.
You need to ensure that the site collection is also accessible at http://collaboration.contoso.com.
What should you do?
A. Run the New-SPSite Windows PowerShell cmdlet.
B. Run the Set-SPSiteUrl Windows PowerShell cmdlet.
C. Add collaboration.contoso.com as an alternate access mapping for the web application.
D. Extend the web application and add collaboration.contoso.com to the Intranet Zone.
what is AAM for?