Which core component of the Cisco Borderless Network Architechture stops attacks

Which core component of the Cisco Borderless Network Architechture stops attacks before they penetrate the network perimeter by protecting resourses and data, in addition to voice, video, and multimedia traffic ?

A.
meidanet

B.
Cisco TrustSec

C.
Cisco Adaptive Security Appliance 5500 Series

D.
Cisco Catalyst 6500 Series

Explanation:
http://www.cisco.com/en/US/docs/solutions/Verticals/Healthcare/MGN_2.0.html

Adaptive Security Appliances are a key component of the Cisco Secure Borderless Network architecture. The Cisco ASA 5500 Series provides intelligent threat defense that stops attacks before they penetrate the network perimeter, controls network and application activity, and flexibly delivers granular, secure remote access, and site-to-site connectivity.