Choice "C" is correct. Executive information systems provide senior executives with immediate and easy access to internal and external information to assist the executives in strategic issues such as non routine decisions that may involve analysis of cyclical data, acquisitions and competitor behavior.Choice "b" is incorrect. Decision support systems (DSS) provide interactive support for managers during decision making. DSS are expert systems that are not specifically designed for the strategic decisions made by executives.Choice "a" is incorrect. Transaction processing systems are systems that process and record routine daily transactions necessary to conduct business. They do not provide strategic level information support.Choice "d" is incorrect. A management information system provides managers and other users with reports that are typically predefined by management and used to make daily business decisions, not strategic decisions.