227. If an LNG sale document is marked as Free on Board (FOB), after discharge who is the owner of the "heel' retained onboard?

A. Seller owns the heel and may keep it onboard as he controls the vessel
B. Seller owns the heel and may heel out
C. Buyer owns the heel and may keep it onboard as he controls vessel 6
D. Seller owns the heel and may keep It to mix with the next cargo