90. What statement is true concerning watertight doors fitted below the waterline of a vessel?

Watertight doors below the waterline may be either of the horizontal sliding type or the swinging hinged type.
Watertight doors below the waterline may be either of the vertical or horizontal sliding type.
Watertight doors below the waterline may be of the vertical or horizontal sliding type or the swinging hinged type.
Watertight doors below the waterline may be either of the vertical sliding type or the swinging hinged type.

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