What should you do to isolate Site1 from the other sites?

Your network contains a Web server.
The Web server is configured as shown in the following table.

Site1 fails intermittently.
You need to isolate Site1 from the other sites.

What should you do?

A.
Assign Site1 to a new application pool.

B.
Add a managed handler to the Handler Mappings of Site1.

C.
Install and configure Windows System Resource Manager (WSRM).

D.
Upgrade the Site1 applications to use .NET Framework version 2.0.

Explanation:
An application belongs to an application pool, which isolates the application from applications in other application pools on the server. In the case of managed code applications, make sure to associate your application together with an application pool that is running the .NET Framework version that your application requires.

http://technet.microsoft.com/en-us/library/cc771654.aspx