ARF Systems sells a finance and payroll application to a corporate buyer. In addition to the software, they offer to install the hardware required to run, install, and maintain the software. It will also train the employees on the usage of the software, and provide engineers to fix any problem that may arise in the software. They fulfill all or a majority of client needs in a particular area. In this scenario, ARF is involved in $\_\_\_\_\_\_\_\_.$

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