It’s either presentation Because the software is used to create a sequence of texting, graphics and often audio and video to accompany a speech or a public presentation, or letter
        
             
        
        
        
Answer:
First we understand what is hash function.A hash function is mostly used in Hashmaps. It maps different keys to a set of values.There may occur a case when we have same key but different values.This case is called collision.So we have to use different collision handling techniques that are open addressing and separate chaining.
A perfect hash function maps key-value pair such that there are no collisions.
 
        
             
        
        
        
Answer:
Whole disk encryption.
Explanation:
Whole disk encryption, also known as, the full disk encryption is a tool that encrypts the entire drive. The whole disk encryption protects the whole hard drive from unwanted visitor to enter into your system. 
<u>This tool protects your entire data, softwares, files, etc stored in the hard drive. Whole disk encryption cedes the entire hard drive unusuable untill correct key is entered to unlock the drive.</u> 
Thus the correct answer is 'whole disk encryption. 
 
        
             
        
        
        
<span>1 X 25 + 1 X 24 + 1 X 23 + 0 X 22 + 1 X 21 + 1 X 20 thus your Answer is C</span>
        
                    
             
        
        
        
It is a unit of disk space allocation for files and directories. Hope this helps :)