A weight of volume VW is glued to the top of a foam block of volume VB. The system is found to float in a tank filled with water with precisely half of the foam block submerged when the weight is on top of the foam block. At this time two marks are made: a blue one on the foam block at the water line and a red one on the tank at the water line. The foam block is then inverted so that weight is now at the bottom and it is placed back in the tank. Which one of the following statements is true?

a. The blue mark is above the water and the red one is above too.

b. The blue mark is above the water and the red one is right on the water line.

c. The blue mark is right on the water line and the red one is too.

d. The blue mark is below the water level and the red one is right on the water line. e. None of the above statements is true.