Security plays an essential role in the Cisco Collaboration Architecture In which layers of the Cisco Collaboration Arch

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Security plays an essential role in the Cisco Collaboration Architecture In which layers of the Cisco Collaboration Architecture is security implemented?

A. Advanced Cisco security solutions are implemented in all layers of the Cisco Collaboration Architecture model.
B. Security is implemented in all the layers except in the medianet services interface layer.
C. Cisco security solutions are integrated into the infrastructure layer and partially into the collaboration services layer
D. Cisco provides advanced security solutions in the infrastructure and collaboration services layers while the collaboration applications layer security is ensured