Which of the following statements is most accurate?

1. BMI calculation is the only measurement a person should use to determine if weight loss is necessary.
2. BMI calculation not paired with waist measurement is the best way to determine if weight loss is necessary.
3. BMI calculation paired with waist measurement is one possible method to determine if body weight is appropriate.
4. BMI calculation paired with waist measurement is the perfect method to determine if weight loss is necessary.