Condition Zebra is fully set when which of the following conditions has been met?

Condition Zebra is a damage control measure used in naval operations to maximize the safety of personnel and the integrity of the ship in the event of a fire or flooding. It represents the most stringent level of readiness to prevent the spread of damage.

When Condition Zebra is declared, the specific fittings that need to be secured include all X-ray and Yoke fittings. X-ray fittings are the least secure, designed to be closed during increased threat levels, while Yoke fittings are more secure and serve as an additional barrier. By ensuring that all these fittings are closed, the ship limits potential access points for smoke, fire, or water, creating a more contained environment. This is a crucial step in responding to emergencies on board.

While the other choices mention various combinations of fittings, they do not encompass the full requirements for establishing Condition Zebra as effectively as the correct answer does. Each fitting type serves a different purpose during varying threat levels, and understanding their specific roles is essential for effective damage control at sea.