Which variable types can Client Actions and Server Actions have?

Client Actions and Server Actions in OutSystems can have a combination of Input Parameters, Output Parameters, and Local Variables, which makes the third choice the correct answer.

Input Parameters allow actions to receive data from other components, enabling dynamic behavior based on external inputs. Output Parameters serve to return results or feedback after an action is executed, facilitating communication between different components or layers of the application. Local Variables, on the other hand, are used to store temporary data that is only relevant within the scope of the action, allowing for more complex processing without affecting the broader application state.

This multifunctional use of parameters and variables is crucial for developing interactive and responsive web applications. It ensures that actions can be versatile, allowing developers to create more robust and maintainable code by managing data efficiently within both Client and Server Actions. Thus, the ability to utilize all three types of variables—Input and Output Parameters alongside Local Variables—enables developers to create rich functionality that adheres to the best practices of modern web development.