A modulating control valve
a) can be oversized
b) is used for steam coils where the condensate is lifted to an overhead return
c) is used for steam coils when the entering air temperature is below 1.5 degrees C
d) can be used to control steam coils when the entering air temperature is above 1.5 degrees C
e) is not used to control steam coils at any air inlet temperature
Answer: D