Which statement is true about the Cisco Self-Defending Network?（）
A. The Cisco Self-Defending Network defines the physical position of the firewall to protect against internal and external attacks
B. The Cisco Self-Defending Network Provides static filtering against known and unknown internal and external attacks
C. The Cisco Self-defending Network Provides dynamic protection against known and unknown internal and external attacks
D. The Cisco Self-defending Network Provides the Elements to install the antivirus software on the End-User Workstatio
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