When the fire pump is already activated and in use, the driver/operator must notify personnel on handlines and other nozzles when they are activating the hydraulic system because:
a. this action may affect the water supply in an unpredictable way.
b. this action will increase the water supply to the nozzles.
c. this action will lower the water supply to the nozzles.
d. this action will stop the water supply to any nozzles or handlines.