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?（）

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.