A and D, hope this helps :)
There are several processes used to explain the removal of dirts or contaminants from surface, but the general name is called Cleaning
Cleaning is an umbrella name that involves the removal of visible soils mater from surfaces, there are other types of cleaning that involves the removal of non-visible matter from surface too e.g sterilisation.
Sterilisation refers to specific action taken to reduce the hazard posed by such contaminants, as opposed to general cleaning.
Learn more about cleaning here:
brainly.com/question/19819390
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A. diagnoaly into the SERVICE BOX
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If something happens to one friend you have another one that can help you. The more people you're with, the safrer you are.
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