What type of parameters can client and server actions have?

Client and server actions in OutSystems can have input parameters, output parameters, and local variables, making the option about having input and output parameters along with local variables the correct choice.

Input parameters are used to receive values from the caller of the action, allowing the action to perform its logic based on external information. Output parameters provide data back to the caller once the action has completed. This is vital for passing results or messages after the execution of the action.

Local variables, on the other hand, are used internally within the action's logic. They facilitate temporary data storage necessary for computations or to hold intermediate results without exposing this data outside the action.

The presence of both types of parameters (input and output) along with local variables provides a flexible and powerful means of handling data flow within actions, making it easier to structure applications and manage how data is passed around. Hence, this mixture of parameters enables comprehensive data management in application logic.