What is the fire resistance of ceramic or silico-calcareous brick factory walls and partitions? I - The fire resistance of walls and partitions ma...

What is the fire resistance of ceramic or silico-calcareous brick factory walls and partitions?

I - The fire resistance of walls and partitions made of hollow, solid or perforated ceramic brick is greater than or equal to 120 minutes when the thickness of the factory is greater than or equal to 110 mm.
II - The fire resistance of walls and partitions made of lightweight clay blocks is greater than or equal to 240 minutes when the thickness of the factory is greater than or equal to 240 mm.
III - The fire resistance of walls and partitions made of concrete blocks is greater than or equal to 180 minutes when the thickness of the factory is greater than or equal to 200 mm.
IV - The fire resistance of walls and partitions made of volcanic blocks is greater than or equal to 180 minutes when the thickness of the factory is greater than or equal to 200 mm.
a) Only I and II are correct.
b) Only II and IV are correct.
c) Only III and IV are correct.
d) All statements are correct.