Which type of gateway will always execute exactly one output?

The XOR (exclusive or) gateway is designed to control the flow of a process based on a single condition, ensuring that only one of its outgoing paths is taken at any time. This makes it ideal for situations where a decision must lead to the execution of precisely one branch of the workflow, reflecting a choice among multiple alternatives. When the XOR gateway is encountered in a process, it evaluates the input conditions and activates only one output sequence flow, effectively preventing any other paths from being executed simultaneously.

In contrast, the other gateway types—AND, OR, and Complex—do not have this single-output characteristic. The AND gateway requires all incoming paths to be completed before any outgoing path is activated, while the OR gateway can allow multiple outgoing paths to be executed depending on the conditions met. The Complex gateway introduces a more intricate decision structure that does not guarantee a single output. Thus, the XOR gateway distinctly fulfills the requirement of executing exactly one output, making it the correct choice.