Which of the following are the four types of gateways?

The four types of gateways in Appian are indeed AND, OR, XOR, and Complex. These gateways facilitate different types of control flows in process models, allowing designers to define how the process should move forward based on certain conditions.

AND gateways are used to model scenarios where all incoming conditions must be satisfied for the process to continue. OR gateways allow process flows to continue if any of the incoming conditions are met. XOR gateways, or exclusive gateways, mean that only one of several conditions can occur, while the others cannot. Complex gateways permit more sophisticated conditions where multiple paths can be taken based on various criteria.

The selected option accurately reflects these commonly recognized gateways in process modeling, highlighting their significance in controlling the flow of processes in Appian. Understanding these gateways is crucial for effectively designing processes that require specific logical paths based on varying conditions.