John the security administrator at Certkiller Inc. is working on purchasing three Cisco 3000 series concentrators. Which three models of the Cisco 3000 Series Concentrator can have redundant power supplies? (Choose three)

A.
Model number 3090

B.
Model number 3080

C.
Model number 3060

D.
Model number 3030

E.
Model number 3020

F.
Model number 3005

Explanation:

Redundant SEP modules (optional), power supplies, and fans (Cisco VPN 3015-3080) Reference: Cisco VPN 3000 Series Concentrators – Cisco VPN 3000 Series Concentrator Data Sheet
Reference: Cisco Courseware page 4-10