Answer: A and C
Explanation:I did it before
 
        
             
        
        
        
Here are the main functions of an operating system:
1) Manage the resources of the device
The operating system controls how much of each resource is distributed, and it controls things like the processing unit and memory.
2) Establish a interface for the user of the device
The operating system must classify what the classes of the script/code have to do and what they implement.
3) Service application software
The operating system must service each application that is downloaded onto the device. It must balance it's use of storage between apps.
 
        
             
        
        
        
Answer:
A.Sam.
Explanation:
We are using Deque interface which is sub type of  Queue interface. Deque supports insertion and deletion from both ends front and end.So it can be used as a queue and stack also.
In this question we have inserted Jack at the front first.Then Rudy at the back then larry also at the tail.Now we have added sam at the front then nothing is added to the front.So the answer is Sam.
 
        
             
        
        
        
Answer:
C
Explanation:
Because they don't want you to share your password