Which of the following is NOT a type of gateway in Appian?

The correct answer is that Event Based is not a type of gateway in Appian. In Appian, gateways are crucial elements in process models that help control the flow of the process based on certain conditions. The three primary types of gateways are Exclusive (XOR), AND (Parallel), and Complex gateways.

An Exclusive gateway (often referred to as XOR) is used when only one of the outgoing paths can be taken based on specific conditions being evaluated. The AND gateway allows concurrent paths to proceed simultaneously, meaning all outgoing paths are activated at once when the gateway is reached. The Complex gateway provides a more advanced way of controlling the flow based on multiple conditions and can accommodate complex decision-making scenarios within a process model.

In contrast, the term "Event Based" refers to a different concept that relates to triggering process flows based on events, rather than directly functioning as a control mechanism for the flow of tasks. It is not categorized as a gateway type in Appian's terminology, distinguishing it from the recognized types that play specific roles in decision-making and branching within processes.