The graphic dotted line between items "27", "12", "9", and "20", shown in the illustration, is used to indicate the use of __________. Illustration MO-0111

Correct Answer: Option A — electrical conduits and circuitry

Dotted lines on engineering schematics conventionally denote electrical control wiring and circuitry interconnecting instrumentation devices, switches, and panels, separating them from process fluid piping and mechanical linkages.