What is the term for a function that is contained within another function?

The correct answer, "B. Nesting," refers to the process where one function is contained within another function. In programming and mathematical contexts, nesting allows a function to utilize the output of another function as an input, creating a hierarchical structure. This enables more complex operations and can simplify code by allowing for functional composition.

For instance, if you have a function that processes data and another function that formats that data for output, nesting allows you to run the formatting function within the processing function seamlessly. This concept is foundational in programming languages where functions can serve as arguments to other functions, facilitating more advanced functional programming techniques.

On the other hand, terms like "Layering," "Chaining," and "Embedding" describe different relationships or processes between functions, but they do not specifically indicate the containment of one function within another as precisely as "Nesting" does. Layering generally refers to structuring where multiple functions operate at different levels, and Chaining often involves calling functions in sequence, where the output of one becomes the input of another without implying direct containment. Embedding can imply including one element within another, but it lacks the specific context of functional relationships that "Nesting" captures, making "Nesting" the most appropriate term for this situation