Which of the following statements concerning the arrangements of a potable water system is true?

Correct Answer: Option C — Potable water pumps of the non-positive displacement type require a vacuum-priming system if located above the potable water storage tanks.

Non-positive displacement pumps, such as centrifugal pumps, are not self-priming. If installed above the suction source (potable water tank), they cannot evacuate air from the suction line to create the necessary lift. A vacuum-priming system is required to remove air and fill the pump casing with water to initiate flow.