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What are the different types of business information system maintenance and what is the purpose of such maintenance? What strategies would you use to ensure that the planned system meets customer requirements while controlling the costs? Provide justifications and citations for your responses.According to Valacich, George, & Hoffer, (2015) there are four different types of business information system maintenance: corrective, adaptive, perfective, and preventive. Corrective maintenance is used to correct design and coding errors. Adaptive maintenance is used as needed to modify the current system to continue using the system. Perfective maintenance is