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A cost benchmark is valid only if the standards are kept up to date. Therefore,option Bis the correct answerA costbenchmarkis a tool used by businesses to assess and evaluate their performance and make informed business decisions. A cost benchmark is a measure of the efficiency of a particular process, which allows companies to compare their performance against that of their competitors.As a result, they can identify areas for improvement and focus on their strengths and weaknesses. A cost benchmark is an effective method for companies to reduce their costs, improve their operational efficiency, and enhance theircompetitive advantage. A cost benchmark is only valid if the standards are kept up to date and reflect current industry trends and best practices. This will ensure that the benchmark remains relevant and useful to the business.A cost benchmark will be more effective when it is based on historical costs and practical andattainable standards. However, the most important factor in a cost benchmark's validity is whether or not the standards arekept up to date.To learn more aboutbenchmarkclick here:brainly.com/question/32505328#SPJ11...