| On most commercial cargo vessels with a relatively small crew size and few users of the potable water system, how is the potable water system pressure maintained? |
| A) Cycling the potable water pump on and off by the action of potable water storage tank level switches in response to system demand changes. |
| B) Allowing the potable water pump to run continuously while recirculating during periods of zero demand for potable water. |
| C) Allowing the potable water pump to run continuously against a shut-off head during periods of zero demand for potable water. |
| D) Cycling the potable water pump on and off by the action of the potable water hydro-pneumatic tank pressure switch in response to system demand changes. |
