Explanation:
It's placed near the door. When a visitor presses the button, the bell rings inside alerting you that someone is at the door.
 
        
                    
             
        
        
        
Answer:
patent
Explanation:
A patent is an intellectual property, with this legal protection, we can exclude to use, sell, and importation of an invention for a limited period of years, but we must do an enabling public disclosure of the invention or discovery, it is a requirement of the patent law, a patent is considered an advantage in the industries world.
 
        
             
        
        
        
B. Integer I think that’s the answer
        
                    
             
        
        
        
Wow!! that is ALOT of info,I dont think i could help with this one Umders 699 maybe someone else can sorry that i couldn`t help :)