Your network contains a server named Server1. Server1 has the Streaming Media Services role installed.

The network contains two subnets named Subnet1 and Subnet2.

You create an on-demand publishing point named Publishing1 on Server1.

You need to ensure that only users from Subnet1 can access Publishing1.

What should you configure from the Windows Media Services console?

A.
From the properties of Server1, configure the Limits settings.

B.
From the properties of Server1, configure the Authentication settings.

C.
From the properties of Publishing1, configure the Credentials settings.

D.
From the properties of Publishing1, configure the Authorization settings.

Explanation:
WMS IP Address Authorization
The WMS IP Address Authorization plug-in is used to control access to your content based on client Internet Protocol (IP) addresses. You can add specific IP addresses or ranges of IP addresses for which you want to allow or restrict access. You can configure the following options on the General tab for this plug-in.

Source: http://technet.microsoft.com/en-us/library/cc770273.aspx