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4. Southcottage Inc. is a manufacturer of washing machines and dishwashers. The requirements document for the new control unit included the following specifications: i. The firmware should be suitable for all six variations of model 2002 washing machines. ii. The water level control module of the washing machine should be suitable for use as a water level control module in the new model 2002 dishwasher. a. To which of the factors do the above requirements belong? b. Explain your