Which of the following is NOT one of the three fundamental ways of sourcing software?

• A. Develop the software in-house
• B. Purchase it from a vendor
• C. Adopt Open-Source Software
• D. Move to a different platform

Answer: (D)

Sourcing software typically falls into three main approaches: build it yourself in-house, buy a commercial solution from a vendor, or adopt open-source software. Building in-house gives you maximum control and customization but takes time and resources. Buying from a vendor provides a ready-made solution with vendor support. Adopting open-source software means using software whose source code is available for inspection, modification, and redistribution, often with a different licensing and support model.

Moving to a different platform isn’t a sourcing method. It’s a platform or deployment decision that changes where or how the software runs, not how you obtain and source the software itself. So it doesn’t fit as one of the three fundamental sourcing options.