Which two statements are true about the Oracle Enterprise Manager （OEM） ？（）

• A、 OEM can do management and monitoring across multiple WLS Domains
• B、 OE is a unified solution for management and monitoring across entire architecture - Web Tier， App Tier & DB Tier
• C、 OEM is focused solely on Oracle solutions， cannot manage 3rd party products
• D、 OEM includes tools to configure the operating system