Explanation: Ship station logs must be kept at the principal radiotelephone operating position or radiotelegraph operating room to ensure they are readily accessible for current entries, historical reference, and immediate inspection by authorized personnel. FCC regulations, specifically in Part 80 governing Maritime Services, mandate this accessibility. The log is a living document of the station's operations. Storing them in a strongbox (A) would make them inaccessible for daily logging. Keeping them in the personal custody of the operator (B) is impractical and would remove them from the station when the operator is off duty. Turning logs over to the ship's master (D) when the operator goes off duty would also make them unavailable for the next watch or for immediate operational review. The operating position is the central point for all radio communications and record-keeping during a voyage.