As one of the advantages of the Catalyst 6500 Series, which is the best description of highest availability? (Select one.)

A.
It has embedded real-time monitoring of VoIP call quality.

B.
It integrates proven, multi-gigabit Cisco security solutions, including intrusion detection, firewall, VPN, and SSL into existing networks.

C.
With Cisco IOS software modularity and redundancy in power supply, supervisor engine, switch fabric, and integrated network services, the 6500 Series provides one- to three-second stateful failover.

D.
Cisco IOS software modularity boosts operational efficiency and minimizes downtime.