[ A ] hexadecimal 

[ B ] decimal  
[ C ] binary  
[ D ] None of these  
[ E ] octal 
[ A ] hexadecimal 

[ B ] decimal  
[ C ] binary  
[ D ] None of these  
[ E ] octal 
Answer : Option C 
Explanation : 
Binary numbers are closely related to digital electronics. With digital electronics, a '1' means that current is present and a '0' means it is not present. The different parts of a computer communicate through pulses of current (1s and 0s) . Computers can calculate complex equations and perform complex calculations. Calculating using only 1s and 0 s is called Binary system. A computer can process only 1s and 0 s. 
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