Random variation is referred to as uncontrollable variation. Thus, the option (a) is correct.
What is variation?
The term variation refers to the change the condition and the position. The variation is the changes not exist on the same point. For example, the variation on the human are skin tone, height, weight, and Harmon.
The random variations are always uncontrollable variation. The unexpected and sudden variation of the random variation are not controlled as dependent variable are create different factor.
As a result, the random variation is called uncontrollable variation. Thus, the option (a) is correct.
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