Final answer:
Rails in an electrical system are intended to be independent and should not draw current from one another to ensure safety and proper functioning.
Step-by-step explanation:
The question relates to the independence of rails in an electrical context, in which ideally, rails should be independent and not draw certain properties from each other. The correct option here is (b) Current because rails are designed to carry current independently without drawing it from each other. This independence ensures proper functioning and safety in electrical systems.
When discussing power distribution, voltage is the potential difference supplied by a voltage source such as a battery, generator, or electrical power plant, which then drives the current through conductors. On the other hand, current refers to the flow of electrical charge carriers like electrons. The question essentially focuses on the uniqueness of the paths for current flow, emphasizing that each rail should carry its own designated current without relying on parallel paths.