What is an ideal Cisco solution to protect a campus network and services from potential security breaches？（）

A.allows them to acquire replacement hardware as needed instead of carrying it in inventory
B.includes upgrade insurance
C.includes Cisco Learning Credits for staff training
D.provides them with trade-in incentives for their end-of-life products

A.Cisco Voice and Video over VPN
B.Cisco Secure Access Control Server
C.Cisco NAC Appliance
D.Cisco Threats Response

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