When a closed type expansion tank on a hot water boiler is completely filled with water and the water in the system is raised in temperature so that it expands, the result will be that the:
a. Circulating pumps cavitate
b. Pressure build up opens the safety relief valve
c. Heating system becomes noisy
d. Circulation pump will stop
e. The boiler water will back-up into the potable water system
Answer: B