Which of the following are considered custom compound data types?

Structures are considered custom compound data types because they allow developers to define a composite data type that combines multiple different types of data. Each field within a structure can have its own data type, which enables the representation of more complex data models needed for applications.

When using structures, developers can encapsulate related data attributes into a single unit, making it easier to manage and manipulate in a consistent manner across the application. This is particularly valuable when there is a need to work with an object-like data model, such as representing an employee with attributes like name, age, and job title.

On the other hand, while arrays and lists are data structures that can hold collections of data, they generally consist of a single data type. Tables, although they may represent complex datasets, are typically seen as an implementation of a structured form, rather than a custom-defined data type. Therefore, they do not fit the definition of custom compound data types in the same way as structures do.