Physical activity could help reduce the chance ofheart disease
        
                    
             
        
        
        
I believe it is D. The Central Processing Unit (CPU) can manage memory and storage. It also makes sure every program has what it needs to keep it up and running. 
        
                    
             
        
        
        
As the name states, during a ground-fault (when the current going out is significantly different than the current going in) the GCFI interupts the current.  Usually by a switch of some sort.  (Pushing the "test" button produces that click, and cuts off the current)
 
        
                    
             
        
        
        
Answer:
Encryption Keys 
Explanation:
In order to make sure only the intended recipient receives the information, encryption keys rely on a unique pattern, just like your house key, except instead of grooves and ridges encryption keys use numbers and letters. 
 
        
             
        
        
        
The three fundamental principles underlying the use of mnemonics are imagination, association and location