Which two series of Cisco Catalyst switches， when placed in the distribution layer， effectively pass high amounts of network traffic between the core and access layers while aggregating access？ （）

A. The Cisco Unified Wireless Network provides the framework to segregate wired and wireless networks to deliver the best security for companies that are deploying WLANs
B. The Cisco Unified Wireless Network provides the framework to integrate and extend wired and wireless networks to deliver the lowest-possible total cost of ownership for companies that are deploying WLANs
C. The Cisco Unified Wireless Network extends wireless awareness into important elements of the network infrastructure， providing the same level of security for WLANs that organizations have come to expect from their VPNs
D. The Cisco Unified Wireless Network extends wireless awareness into important elements of the network infrastructure， providing the same level of security， sociability， reliability， ease of deployment， and management for WLANs that organizations have come to expect from their wired LANs

A. IP7961
B. IP8961
C. SPA504
D. SPA9000

A. Catalyst 2800/E Series
B. Catalyst 3750 Series
C. Catalyst 3900/E Series
D. Catalyst 4500/E Series
E. Catalyst 6500/E Series