问题：

[单选] 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 issue