You work as a network technician at Certkiller .com. Please study the exhibit carefully. What does "locking Down" the router entail？（）

• A、Disabling HTTPS access to Cisco SDM
• B、Prohibiting console access to Router
• C、Preventing any alterations to the router’s running configuration
• D、Disabling all vulnerable Services on the Router
• E、Shutting down all the router’s interfaces