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Imagine you are building an elevator control software. Give examples for a functional requirement, a quality requirement, and a general condition that the system must fulfill (one example for each). (5%) According to the INVEST model, user stories should be estimable and negotiable (among other characteristics). Explain what these two characteristics mean, and give a counter-example (i.e. a user story violating the principle) for each of the two. (5%) Imagine you are building an elevator control software. Give examples for a functional requirement, a quality requirement, and a general condition that the system must fulfill (one example for each). (5%) According to the INVEST model, user stories should be estimable and negotiable (among other characteristics). Explain what these two characteristics mean, and give a counter-example (i.e. a user story violating the principle) for each of the two. (5%)