An internet purchase process requires users to have the ability to cancel the order at any step in the process. The process analyst needs to model this requirement for implementation. Which of the following elements should be used to model how to receive a cancellation event from an external process into the purchase process?

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An internet purchase process requires users to have the ability to cancel the order at any step in the process. The process analyst needs to model this requirement for implementation. Which of the following elements should be used to model how to receive a cancellation event from an external process into the purchase process?