What is the correct interpretation of census counts and population estimates?

• A decennial census count is a business-registration count, while a later annual figure is an estimate
• A decennial census count is a direct population enumeration, while a later annual figure is an estimate
• A decennial census count is a GDP growth estimate, while a later annual figure is an estimate
• A decennial census count is a land-area measurement, while a later annual figure is an estimate