Which Cisco security software product mitigates Day Zero attacks on desktops and servers – stopping known and unknown attacks without requiring reconfigurations or updates on the endpoints?

Which Cisco security software product mitigates Day Zero attacks on desktops and servers without requiring reconfigurations or updates on the endpoints?

A.
Cisco Trust Agent (CTA)

B.
Cisco Security Agent (CSA)

C.
NAC Appliance Agent (NAA)

D.
Cisco Secure Desktop (CSD)

E.
SSL VPN Client (SVC)