What is the essential difference between the nursing prevention model and the medical prevention ...

What is the essential difference between the nursing prevention model and the medical prevention model?
 
  a. The medical model targets universal populations; the nursing model targets a selective population.
  b. The medical model assumes that all people are at equal risk; the nursing model attempts to identify those who are more vulnerable.
  c. The medical model attempts to identify the most likely cause of the disease; the nursing model stresses that mental disorders are multicausal.
  d. The medical model offers a continuum of nonspecific preventive measures; the nursing model offers one specific, tested, preventive measure.