What allows for a higher level of systems management capability that reduces the risk of changeas well as management and administrative costs？（）

A. extends networkQoS throughout the network
B. simplifies management of central or remotely locates access points
C. ensures implementation of the most recent security protocols
D. streamlines wireless LAN management
E. extends features for optical traffic network services

A. by enabling businesses to leverage investments in the network
B. by spending less time addressing attacks
C. by enforcing policy compliance
D. through admission control