Which diagram graphically depicts the movement of information within a system?

The dataflow diagram is specifically designed to represent the flow of information within a system, making it the most appropriate choice for this question. It visualizes how data moves from one process to another, highlighting data inputs, outputs, storage points, and the paths connecting these elements. This type of diagram helps stakeholders understand intricate processes and data interactions, making it essential for system analysis and design.

In contrast, a site survey diagram focuses on the physical layout and location of components within a site, making it more about spatial arrangement than data flow. An architectural diagram outlines the structure of a system, including its components and their interconnections but does not specifically illustrate how information is processed or flows through those components. A network diagram depicts the configuration of network devices and their interconnections, which pertains more to network infrastructure than the movement of data within a system.