Which option is not valid for the On Click property of a Button in a Screen?

In the context of the On Click property of a Button in a Screen within OutSystems, the option that is not valid is the choice referring to "Block."

The On Click property is intended to trigger various types of actions when a button on the screen is clicked. Valid options typically include specific actions that are executed in response to the event, such as server-side or client-side logic.

The term "Event" relates to the triggering action itself, which is useful in determining if any event handler needs to be executed. "Action" encompasses operations that can be executed when the button is clicked, usually defined within the OutSystems environment. "Client Action" specifically indicates that the logic to be executed occurs on the client side, which is also a valid configuration for button interactions.

In contrast, the term "Block" does not correspond to a functional interaction linked to the button. While blocks are components or reusable sections of UI, they do not serve as a direct action that can be triggered from the On Click property of a button. Therefore, this distinction makes “Block” the incorrect choice, as it does not represent an actionable configuration for the button's click event.