Final answer:
Ceremonial procedures for ship entry or exit from a harbor usually involve saluting the flag, playing the national anthem, and displaying signal flags, though practices can vary by country and port.
Step-by-step explanation:
Ceremonial procedures for entering and leaving a harbor can be steeped in history and maritime tradition. These procedures often involve various customs such as a salute to the flag, playing of the national anthem, and the display of signal flags. When a ship enters or leaves a harbor, it is a common practice to show respect to the nation by saluting the flag which can involve lowering and raising the flag at designated times, such as sunrise and sunset. The playing of the national anthem is sometimes a part of this ceremonial procedure, especially during special occasions or when naval or coast guard ships are involved. Additionally, signal flags may be displayed to communicate intentions and show respect for maritime protocol. While the option 'd) All of the above' might seem correct, it generally depends on the country and the specific protocols of the port whether these actions are taken singularly or combined.