Which of these can be included in an Expression rule?

In an Expression rule, it is essential to understand that you can include various elements that enable dynamic and reusable logic within your Appian applications. All the elements listed are valid components that can be utilized within an Expression rule.

Including other expression rules allows for modularity and reusability, letting you build complex logic by combining simpler, pre-defined expressions. This practice streamlines development and improves maintainability since you can update one expression rule and have changes reflected wherever it is used.

Constants are another critical aspect, as they provide fixed values that your expressions can reference. Defining constants can enhance clarity and reduce errors, particularly when the same values are used across multiple expressions.

Rule inputs are also a fundamental feature of Expression rules. They allow you to pass dynamic data into the Expression rule, enabling the logic to operate with different inputs each time it is called. This functionality is crucial in creating flexible and reusable components within your application.

Therefore, the correct choice indicates that each of these individual elements—other expression rules, constants, and rule inputs—can be incorporated within an Expression rule, which is why the selection of all answers being correct is accurate. This comprehensive understanding is essential for effectively utilizing Expression rules in Appian.