Tara and zach are leading a systems development project and they want the investigation phase to go smoothly and quickly. they decide to use because it will also with the analysis and design phases.
a. direct observation
b. agile systems development
c. functional decomposition
d. joint application development

joint application development

Explanation:

Joint Application Development (JAD) is a development methodology system originally used for designing a computer-based system, but can be applied to any development process. It involves continuous interaction with the users(for analysis) and different designers of the system in development.

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