What action should you be prepared to take when verifying a security solution？（）

• A、having alternative addressing and VLAN schemes
• B、having a rollback plan in case of unwanted or unexpected results
• C、running a test script against all possible security threats to insure that the solution will mitigate all potential threats
• D、isolating and testing each security domain individually to insure that the security design will meet overall requirements when placed into production as an entire system