EDVAC was produced using which of these concepts ?

Answer Details

Before this machine was built, early computers had to be manually rewired or reconfigured with switches every time a different task needed to be run, which made changing a program a slow physical process. This computer introduced a design in which the instructions of a program, along with its data, could be stored electronically in the computer's own memory alongside each other, so the machine could read and execute instructions automatically without being physically rewired. This design idea is known as the stored-program concept, and it became the foundation for how virtually all modern computers operate.

The other concepts listed belong to computer networking rather than to the internal design of a single early computer. Packet routing and packet switching both describe how data is broken into small units and directed across a network to reach its destination, technologies developed decades later for communication between separate computers. Circuit switching describes an older telecommunications method, used in traditional telephone networks, where a dedicated connection is held open for the entire duration of a call. None of these three ideas describe how a single computer stores and executes its own instructions internally, which is exactly what this machine was built to demonstrate.

When a question links a historic computer to a "concept," check whether the concept concerns how the machine processes instructions internally (such as the stored-program idea) or how separate machines communicate over a network (routing, switching); these are two entirely different areas of computing history.