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.