You have a SharePoint Server 2010 server farm.

You have a Web application that is accessed by using the URL https://portal.contoso.com.

You need to add a new site collection to the Web application. Users must be able to access the site collection by using the URL https://hrweb.contoso.com.

What should you do?

A.
From Central Administration, extend the Web application.

B.
From the SharePoint 2010 Management Shell, run the new-spsite cmdlet.

C.
From Central Administration, create a new site collection, and then add an alternate access mapping.

D.
From Internet Information Services (IIS) Manager, create a new virtual directory, and then modify the site bindings of the Web application.

Explanation:
BURGOS MNEMO: "create a new site collection"

@Jorbes explanation
the new-spsite cmdlet does not add the alternate access mapping, so you need to add the site via CA and add the alternate access mapping afterwards.

http://technet.microsoft.com/en-us/library/cc262839.aspx