Which of the following correctly defines macromolecular transport?

• A. Macromolecular transport involves the movement of large molecules into and out of the cell via endocytosis and exocytosis.
• B. Macromolecular transport involves the movement of small ions across the cell membrane.
• C. Macromolecular transport only occurs during active transport processes.
• D. Macromolecular transport is a form of passive transport that uses protein channels.