C
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When hard disk drives became standard in most PCs in the later 1980s, since the first two letters were already commonly used for these floppy drives, they logically labeled the third storage device “C”, even though it now tended to be the main storage medium for the computer, including usually containing the operating system.
 
        
                    
             
        
        
        
Answer:
<h2>YEET B </h2>
Explanation:
Sorry
Its B: a type of what-if analysis that allows a user to define multiple variables for multiple functions or formulas
(i think)
 
        
                    
             
        
        
        
Answer:
Free/busy settings can be enabled.
One extra time zone can be created.
Display and theme settings can be changed.
Options are accessed through the Backstage view.
Explanation:
Just took it
 
        
             
        
        
        
Answer:
Number of packets ≈ 5339
Explanation:
let 
X = no of packets that is not erased.
P ( each packet getting erased ) = 0.8
P ( each packet not getting erased ) = 0.2 
P ( X ≥ 1000 ) = 0.99
E(x) = n * 0.2
var ( x ) = n * 0.2 * 0.8 
∴ Z = X - ( n * 0.2 ) /  ~ N ( 0.1 )
   ~ N ( 0.1 )
attached below is the remaining part of the solution
note : For the value of <em>n</em> take the positive number