Choice ''b'' is correct. An ad hoc report is one that is created on demand generally to meet unique specifications that respond to a specific requirement (e.g., a survey). A well-designed database system (a database system is assumed in this question) should be able to produce this type of ad hoc report when required.Choice ''c'' is incorrect. An exception report is produced when a specific condition or ''exception'' occurs. There is no such condition in this case.Choice ''d'' is incorrect. A periodic scheduled report is a traditional report that displays information in a predefined format and that is made available on a regular basis. The report above is a specialized report that would not be considered ''traditional.''Choice ''a'' is incorrect. A push report is a report that is ''pushed'' to a computer screen or desktop. It is typically a report that is needed regularly, possibly because the data that is being reported changes often.