What happens to variability when independent processes are combined to form a larger process?

What happens to variability when independent processes are combined to form a larger process?
A .  variability of individual processes cancel out each other, resulting in a small overallvariability
B .  variability of the total time is equal to the variability of the component with the largestvariability
C .  variability of the total time equals the sum of the variability in all the component times
D .  variability of the total time is equal to the variability of the component with the smallestvariability

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Answer: C