You need to ensure that users throughout the farm can specify that results…

You configure a SharePoint Server 2010 Service Pack 1 (SP1) server farm. The farm contains a single
Search service application that has two index servers and 8 million documents. You need to ensure
that users throughout the farm can specify that results for an individual query should include
content only from a SharePoint web application that has the http://www.contoso.com URL. What
should you do?

A.
Add a new index partition and distribute the existing index across the two index servers.

B.
Add a new crawl rule and specify the path where the rule will apply. In the Crawl Configuration
section, select the Include all items in this path option.

C.
Add a new federated search location. In the Restrictions and Credentials Information section,
select the Use restriction: Only allowed sites can use this location option

D.
Add a new content source and specify its start address. Add a crawl schedule, and initiate a full
crawl.

E.
Add a second Search service application and distribute the indexed content across the two index
servers.

F.
Add a new crawl rule and specify the path where the rule will apply. In the Crawl Configuration
section, select the Exclude all items in this path option.

G.
Add a new search scope at the site administration level. Add a scope rule that uses the Content
Source rule type.

H.
Add a new search scope at the service application level. Add a scope rule that uses the Web
Address rule type.

Explanation:
A content source is a set of options that you can use to specify what type of content is crawled, what
URLs to crawl, and how deep and when to crawl. The default content source is Local SharePoint
sites. You can use this content source to specify how to crawl all content in all Web applications that
are associated with a particular Search service application. By default, for each Web application that

uses a particular Search service application, SharePoint Server 2010 adds the start address of the
top-level site of each site collection to the default content source.
Some organizations can use the default content source to satisfy their search requirements.
However, many organizations have to have additional content sources. Plan additional content
sources when you have to do the following:
Crawl different types of content — for example, SharePoint sites, file shares, and business data.
Crawl some content on different schedules than other content.
Limit or increase the quantity of content that is crawled.
Set different priorities for crawling different sites.
You can create up to 500 content sources in each Search service application, and each content
source can contain as many as 500 start addresses. To keep administration as simple as possible, we
recommend that you limit the number of content sources that you create.
http://technet.microsoft.com/en-us/library/cc262926(v=office.14).aspx