79. What statement is true concerning the construction of watertight bulkheads?

The strakes of the bulkhead are horizontal, and the stiffeners are vertical and the bulkhead must have increasingly greater strength towards the top.
The strakes of the bulkhead are horizontal, and the stiffeners are vertical and the bulkhead must have increasingly greater strength towards the base.
The strakes of the bulkhead are vertical, and the stiffeners are horizontal and the bulkhead must have increasingly greater strength towards the base.
The strakes of the bulkhead are vertical, and the stiffeners are horizontal and the bulkhead must have increasingly greater strength towards the top.

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