The following are concepts of health:
1. it is a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity
2. it is the ability to maintain balance
3. it refers to maintaining the internal environment
4. it is the integration of all parts and subparts of an individual

a. 1,2,3
b. 1,3,4
c. 2,3,4
d. 1,2,3,4