What is the traditional mode for a firewall？（）

A. It helps verify end-to-end path availability.
B. It provides traffic rerouting in case of disaster.
C. HSRP， GLBP， and VRRP can be clients of GSS.
D. BGP must be the routing protocol between the distributed data centers.
E. DNS responsiveness is improved by providing centralized domain management.

A. It can take on HSRP， VRRP， and GLBP as clients.
B. It provides automatic inbound route optimization.
C. Path selection may be based on delay， loss， or jitter.
D. The border router makes decisions about which outbound path to use.
E. Automatic load distribution is provided for multiple connections.