Final answer:
A physical Data Flow Diagram depicts a system's infrastructure, showing its hardware, software, and other physical components, while a context diagram and system flowchart serve different purposes by focusing on external interactions and process sequences, respectively.
Step-by-step explanation:
A diagram that depicts a system's infrastructure can be referred to as a physical Data Flow Diagram (physical DFD). Unlike a logical DFD, which focuses on the flow of information and the processes without regard to the physical components involved, the physical DFD provides details about the actual hardware, software, files, and people involved in an information system. In contrast, a context diagram shows the system of interest along with its interactions with external entities, and a system flowchart illustrates the sequence of processes within a system, including data flows, data processing steps, and components of the system such as hardware and software.