The correct answers are A and B . In Function Analysis and FAST diagramming, a higher-order function is positioned to the left of the basic function and answers the question “Why is this function performed?” It represents the broader purpose or need that is satisfied when the basic function is successfully achieved. Therefore, option A is correct because the higher-order function expresses the customer, user, or project need served by the basic function.
Option B is also correct because the higher-order function can be understood as the output or result produced by accomplishing the basic function. In FAST logic, the basic function performs a required action, and the higher-order function explains the reason or outcome of that action. It is not normally the detailed mechanism for achieving the basic function.
Option C is incorrect because the basic function , not the higher-order function, is fundamental to the subject scope. The higher-order function often lies just outside or above the study scope as the reason the basic function is needed. Option D is incorrect because inputs or enabling actions are usually associated with lower-order or “how” functions, not higher-order “why” functions.
References/topics: Function Analysis Phase; FAST Diagramming; Higher-Order Function; Basic Function; How/Why Logic.
