Answer:
C
Explanation:
the bus schedules could be swapped
 
        
             
        
        
        
Answer:
0C) seeing how the details fit together
Explanation:
If Ivan thinks about the details provided in an information text... He should be seeing how the details fit together
 
        
             
        
        
        
I think the questions that must be ask are: 
a.What does “encryption” mean?
d.What are “key distribution problems”?
All the text is based on the concept "encryption" so it is very important to know what it means in order to undestand the rest of the information. If not, you will be missing important facts. In addition, there are a lot of words used that are derived from this one, so you won't be able to undestand them. 
Another important concept that gives a lot of information just by knowing it's meaning is "key distribution problems", they could be two or a thousand, it is  important to know what they are and what they do. 
The other question that seems important is the one of the "public key cryphtography" but this one can be inferred by the context. 
 
        
                    
             
        
        
        
Answer:
1. environment
2. is a psychological pattern in which an individual doubts their skills, talents or accomplishments
3. receiving money in exchange for advertising through a post
]
Explanation: