What makes the Cisco End-to-End solution superior to competitor offerings?（）

A. The Cisco Full-Service network foundation delivers a layered security approach that introduces interoperability issues
B. The Cisco Full-service Network Foundation Increases the support Cost
C. The Cisco Full-Service Network Foundation delivers a static single layer security approach that eliminates the interoperability issues
D. The Cisco Full-Service Network Foundation Delivers a layered security Approach that eliminates the interoperability issues