Answer:
d. proof-of-concept
Explanation:
Literally , a proof of concept is meant to determine the feasibility of the idea or to verify that the idea will function as envisioned. It is an exercise in which work is focused on determining whether an idea can be turned into a reality. Its focus is to test whether the idea is viable, by giving those involved in the proof-of-concept exercise the opportunity to explore the idea's potential to be developed or built.
