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Following are the questions that need a solution for minimum 500 words per question. Please be advised it needs proper citation and quality references in order to do well in the assignment.Plagiarism would be strictly monitored through our software.Following are the questions:The use-case diagram shown in Figure A-1 captures the Student billing function but does not contain any function for accepting tuition payment from students. Revise the diagram to capture this functionality. Also, express some common behavior between two use cases in the revised diagram by using “include” relationships.2.When should you use an Agile method, and when should you use an engineering-based method for developing a system? Support your answer.

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