Final answer:
HDL, or high-density lipoprotein, is the good cholesterol transporter that helps remove excess cholesterol from the blood. Therefore, option D - All of the above are true - is the correct statement about HDL.
Step-by-step explanation:
HDL, which stands for high-density lipoprotein, is the good cholesterol transporter. It collects cholesterol from other tissues and returns it to the liver, where it can be metabolized. This process helps to remove excess cholesterol from the blood and arterial walls, reducing the risk of heart disease. Therefore, the correct statement is option D: All of the above are true.