PMP Exam Simulator

You are managing a project to develop software for simulating engine work for an automobile manufacturer. Your team is looking for a less expensive way to complete this work. You are focused on achieveing more out of the project to decrease cost, improve quality and optimize schedule without impacting the scope. Currently, you and your team are thinking about using agile methodology or implementing test-driven development as these would contribute to a decrease in cost and schedule optimization and would not affect the scope. Which technique are you most likely using?