The System Browser in Revit provides a hierarchical view of the electrical distribution system. In the provided exhibit, "Panel P4" is shown as a child element nested directly under "Panel P 3". This parent-child relationship visually represents the electrical connection, indicating that Panel P4 is fed by a circuit originating from Panel P3. The other panels (P1, P2, P5) are shown at different levels or as siblings, not as the direct supplier to P4.

A. Panel P1 is shown at the same hierarchical level as P3 in the distribution tree, not as the parent panel for P4.

B. Panel P2 is also shown at the same level as P3, indicating it is not the source for Panel P4.

C. Panel P5 is shown as a sibling to Panel P4, meaning both are supplied by the same parent panel (P3).

1. Autodesk, Inc. "Use the System Browser". Autodesk Knowledge Network, Revit 2023 Help. Accessed October 2023. The documentation states, "The System Browser displays a hierarchical list of all the components for each discipline... For electrical systems, it shows the distribution system, from the power source to the individual devices." This confirms the hierarchical representation of circuits.