A person who is heavier than the standard for their height is generally considered "overweight" if their weight falls within a certain range above the normal weight according to BMI (Body Mass Index) classifications. If their weight is significantly above the normal range, they may be categorized as "obese." There are further classifications within obesity, such as "class 1 obesity," "class 2 obesity," and "class 3 obesity" (which is often referred to as "extremely obese").
"Obese" typically covers a range of BMI from 30 to 39.9, while "extremely obese" (or class 3 obesity) is a BMI of 40 or higher. The term "hefty" is more informal and subjective and doesn't have a precise medical definition.
So, the most accurate classifications from your options are "overweight" and "obese," with "extremely obese" being a specific type of obesity.
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