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A researcher became a chef with a resort hotel chain for six months to observe food-handling practices. he saw food preparers using the same towel to wipe their hands, the counter, the food slicer, and cooking utensils during one food preparation session. in addition, he found the chefs tasted the food using their fingers. the researcher used _____ research to determine that more monitoring is needed to make sure that food handlers comply with sanitary regulations.