问题：

[单选]

You have a Web server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2).
Server1 hosts two Web sites named App1 and App2. Each Web site is configured to use a unique IP address.
You notice that when App1 fails, App2 also fails.
You need to ensure that if App1 fails, App2 continues to be available.
What should you do?（）

A . Add another worker process to the DefaultAppPool.
B . In the DefaultAppPool, enable CPU monitoring.
C . In the DefaultAppPool, configure the identity to use the IWAM_Server1 account.
D . Create a new application pool, and then configure App2 to use the new application pool.