The three most common operating systems for personal computers are Microsoft Windows, Apple Mac OS X, and Linux.
        
                    
             
        
        
        
Answer:
The Firewall (Router) is the vulnerable hardware.
Explanation:
The entry into the network will be the firewall (If there is a firewall installed on the network), if this medium is compromised, every workstation on the network will be vulnerable.
 
        
             
        
        
        
The answer is : the run() method defined in BMW will be called. 
run() BMW