In a numbered sufficient techniques list, what must be done?

In a numbered sufficient techniques list, all items in the list must be utilized to ensure a comprehensive understanding and proper application of the subject matter. This requirement emphasizes the importance of each item contributing to the overall goal of providing thorough techniques or steps for a given process.

By using all items, a user or reader is capable of achieving the intended outcomes of the list, as each numbered point typically represents a critical aspect of the topic being addressed. Whether it's in the context of guidelines, procedures, or methods, ensuring that every listed item is considered prevents gaps in knowledge and promotes a holistic approach to implementing the techniques presented.

The other options may seem feasible in some contexts but do not align with the structure and purpose of a sufficiently comprehensive list. Selecting only relevant items or leaving items out could lead to incomplete understanding or execution. Therefore, the focus on using all items solidifies the integrity and reliability of such a numbered sufficient techniques list.