External Actions have both input and output ports.

• A. True
• B. False
• C. Only input ports
• D. Only output ports

Answer: (A)

External Actions are reusable pieces of a workflow that participate in a data stream by receiving features and producing features. They define input ports to accept incoming data and output ports to deliver the results after processing. Because a useful action both consumes data and yields transformed data, it must expose both kinds of ports. This allows you to connect the action into a workspace: feed features in through the input ports, and connect the output ports to subsequent transformers or actions to continue the flow. Having only input ports would leave no results to pass along, while having only output ports would leave nothing to process in the first place. So External Actions are designed with both input and output ports.