Which type of software would the Cisco Catalyst 2950 Series switches use to deliver intelligent services to networks that require additional security， advanced QoS， and high availability？（）

A.point-product security
B.endpointsecurity
C.network infrastructure security
D.secure access and threat defense

A. PEC
B. Cisco Networking Academy Program
C. Cisco TAC
D. Cisco Partner Specializations Program

A. enables automated threat response
B. enables noncompliant device access
C. enables endpoint posture enforcement
D. enables third-party client and server protocols