672. "During the inerting operation prior aerating why is the inert gas (IG) fed via the loading line tank bottom and exhausted through the tank top?"

A. The heavier IG is led to the bottom to displace the lighter methane mixture.
B. The lighter IG is led to the bottom to displace the heavier methane mixture.
C. The IG is fed through the tank top to maximize pressure
D. The IG is exhausted through the tank bottom to create a vacuum.