| What is the primary purpose of the lead-lag arrangement of the two potable water pumps supporting a typical potable water system? |
| A) Enabling the lead pump to cycle on and off during periods of relatively low demand and the lag pump to assist the lead pump only when the demand is high. |
| B) Enabling the lead pump to pump against a shut-off head during periods of relatively low demand and the lag pump to recirculate when the demand is high. |
| C) Enabling the lag pump to cycle on and off during periods of relatively low demand and the lead pump to assist the lag pump only when the demand is high. |
| D) Enabling both potable water pumps to cycle on and off together in response to system demand changes. |
