Which sentences are true regarding grey zones in system scope and context scope?

The statement you have chosen has merit in terms of highlighting the distinction between relevant and irrelevant factors in the system's environment. Specifically, the concept of the "irrelevant part of the system environment" being deemed as having no impact on the requirements underscores the principle that effective requirements engineering focuses only on those elements that have a direct bearing on the system's functionality and objectives.

In requirements engineering, understanding the context scope is crucial because it helps delineate what elements are essential for defining the system's requirements and what aspects are extraneous. By clearly identifying and excluding irrelevant parts, teams can reduce complexity, avoid misunderstandings, and ensure that the requirements are both actionable and aligned with the project's goals.

The other statements present interpretations of grey zones and context scope that involve immediate resolutions or ambiguous aspects, which do not accurately capture the essence of how grey zones function. Specifically, grey zones often require ongoing discussion and clarification rather than immediate resolution, and they frequently include elements needing further definition or clarification, rather than simply being irrelevant. Thus, the focus remains on utilizing context scope to understand what's critical for the requirements, aligning with best practices in systems engineering.