Doors in Watertight Bulkheads UI Quiz Set A

Source: Unified interpretations of SOLAS chapter II-1, Parts B-2 – Subdivision, Watertight and Weathertight Integrity and B-4 – Stability Management – Doors in watertight bulkheads of passenger ships and cargo ships.
Reference: imorules.com – SOLAS II-1 Parts B-2 and B-4 unified interpretations

4. Under "frequency of use whilst at sea", a door classified as used is one that is:

A) kept open at sea and closed only on the master's order B) kept closed at sea and never opened during navigation under any circumstances C) kept closed but may be opened during navigation when authorized by the Administration to permit the passage of passengers or crew, or when work in the immediate vicinity necessitates it D) opened only in port, the times of opening and closing being entered in the logbook

Doors in Watertight Bulkheads of Passenger Ships and Cargo Ships – Unified Interpretation – Set A