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Answer:refers to how a cost will change as activity level changesExplanation:Cost behaviour is defines as how a business's expenses will change as a result of changes in its activities.Business managers need to consider activities that may lead to spike or decline in the in expenses.This will lead a robust annual budget that meets the cost need of the business.Cost behaviour is divided into 3:- variable costs that vary directly with changes in business activities. For example direct material cost.- fixed costs that do not change as business activity changes. For example rent- mixed costs have a mixture of variable and fixed costs. For example cell phone service that has a fixed charge monthly and also a variable charge for texting...