Which of these is a benefit of an integrated security management system？  （）

• A、 It provides configuration， monitoring， and troubleshooting capabilities across a wide range of security products.
• B、 It integrates security device management products and collects events on an "as needed" basis to reduce management overhead.
• C、 It integrates security management capabilities into the router or switch.
• D、 It provides a single point of contact for all security configuration tasks thereby enhancing the return on investment.
• E、 It leverages existing network management systems such as HP OpenView to lower the cost of implementation.