What capability allows users to understand whether the software is suitable and how it can be utilized for specific tasks?

The capability that allows users to understand whether the software is suitable and how it can be utilized for specific tasks is related to understandability. This refers to how easily users can comprehend the functionalities and features of the software, which directly influences their ability to effectively interact with it. A system is considered understandable when users can readily grasp how to use the software to achieve their goals, including understanding its purpose, how it operates, and how it can fulfill their specific needs.

While concepts like testability, usability, and accessibility are also relevant in the context of software quality and user interaction, they focus on different aspects. Testability relates to how easily a system can be tested, usability specifically assesses how user-friendly the software is, and accessibility pertains to how well the system accommodates users with disabilities. Therefore, understandability stands out as the most appropriate answer for assessing whether users can determine the suitability of the software for their tasks.