Now, I suspect the answer is c. As this is how to "delete a file". For the same result, in windows, you can hold shift then press delete, and it will permanently delete it in the same way. 
However, when you a delete a file, the file is not physically removed from the disk until that files sector('s) (sectors are the smallest addressable unit of a hard drive) is overwritten (works a bit differently for ssd's).   
        
             
        
        
        
Answer:
The statement is True
Explanation:
When talking about computer security, we can define covert channels as an attack on a system capable of creating a loophole for information objects transfer between various processes that would normally not allow communication under the computer security policy. Hence, the best defenses system against this kind of attack is via Intrusion Defense System and Intrusion Prevention System and relentlessly "watching all aspects of an IT infrastructure for aberrant or abnormal events of any type."
 
        
             
        
        
        
 Answer:
C) Multiple reviewers have to be able to view one another's changes after they are made.
Explanation:
 
        
             
        
        
        
<span>Hanging out with friends, watching your favorite TV show, and buying a pair of new shoes are all examples of rewards for doing well in school. As the result of doing well in studies, a person can hang out with friends, watch their own favorite TV show and can buy a new pair of shoes. Hence all these things are the rewards that are being generated for a good performance in school.</span>