After purging a liquid oxygen (LOX) storage and transfer cart, the next step is to
a. continue to allow the unit to cool the cryotainer to 120 degrees Fahrenheit (°F).
b. continue to allow the unit to cool the cryotainer to 150°F.
c. turn off the unit and let the cryotainer to cool down to 120°F.
d. turn off the unit and let the cryotainer to cool down to 150°F.
Answer: B