I guess the best answer is Virus. 
Virus is a malicious computer program that is designed to create annoying glitches or destroy data.
 
        
                    
             
        
        
        
<u>Answer:</u>
<u>Privacy concerns.</u>
<u>Explanation:</u>
Privacy concerns have played an important role in how we collect digital data. For example, privacy activists believe that an individual has the right to know how his or her information is being used and that such an individual also has the right to withhold such information.
Such issues have affected the ability of law enforcement agencies to investigate criminal activities. For example, an individual who is accused of a crime may claim a <em>right to withhold his personal information, such as his mobile device, and thus he refuses to give out such information.</em>
 
        
             
        
        
        
Answer: Falsifiability
Explanation: Falsifiability is the term that is defined as the evaluation of any particular hypothesis or theory to be proven wrong .This feature gives the access that the theory can be tested and have more accurate claims .
The ESP(Extrasensory perception) theory  can also have feature of being falsifiable because the experiments and test lead to the issue that the negative effects of the theory are not certain which might occur due to simple observation of effects.
 
        
             
        
        
        
Answer:
Yes, but this must be done before the withdraw deadline
Explanation:
TopHat is an online learning platform. Students register for courses and if they decide not to continue with a course for reasons best known to them, they are allowed a time period usually one to two weeks to drop the courses. They are then reimbursed the fee for that particular course. 
But if that time period elapses and they drop the course, that is considered a withdrawal that is not accepted and which no provisions for reimbursements are made.