To prevent heart problems, it is important to consider the levels of different types of cholesterol in the blood. Cholesterol is a waxy substance that is found in all cells of the body and is important for various functions. However, high levels of certain types of cholesterol can increase the risk of heart disease.

Option 1 states that a low cholesterol level is necessary to prevent heart problems. This is generally correct because high levels of total cholesterol, specifically low-density lipoprotein (LDL) cholesterol, are associated with an increased risk of heart disease. LDL cholesterol is often referred to as "bad" cholesterol because it can build up in the arteries and lead to blockages.

Option 2 states that a high HDL level is necessary. This is also correct because high-density lipoprotein (HDL) cholesterol is often referred to as "good" cholesterol. HDL cholesterol helps remove LDL cholesterol from the blood and transport it back to the liver for excretion.

Option 3 states that a high VLDL level is necessary. This is incorrect. Very low-density lipoprotein (VLDL) cholesterol is a type of cholesterol that carries triglycerides, another type of fat, in the blood. High levels of VLDL cholesterol are not beneficial and are