Final answer:
In a physical data flow diagram (DFD), the component that transforms data is a data flow.
Step-by-step explanation:
In a physical data flow diagram (DFD), the component that transforms data within the system is a. data flow.
Data flows represent the movement of data from one point to another within the system. They illustrate how data is input, processed, and output in a system. Examples of data flows could include a customer's order being received and processed by the system, or a payment being recorded and sent to a database.