Which type of Marine Sanitation Device (MSD) is used solely for the storage of sewage and flush water at ambient air pressure and temperature?

Correct Answer: Option C — Type III

Type III Marine Sanitation Devices are defined as holding tanks. They are designed solely for the retention of sewage and flush water at ambient pressure and temperature, preventing any overboard discharge. These systems are commonly used in areas where discharge is prohibited, requiring pump-out at authorized shore facilities.