The inverted bucket steam trap, as applied to steam heating coils,
a. Is used when the coil steam pressure is higher than 172 kPa or 25 psig
b. Is used when considerable air venting is required
c. Does not require a strainer
d. Is recommended when condensate flows by gravity into a return main at atmospheric pressure
e. Is more expensive than a Float and Thermostatic trap
Answer: A