According to system approach, Carzo and Yanouzas identify which of the following elements as sub-systems?
1.Technical sub-system
2. Goals and value sub-system
3. Power sub-system
4. Structural sub-system
5. Social sub-system

A. 1, 2 and 4

B. 1, 2, 3, 4 and 5

C. 1, 3 and 5

D. 2, 4 and 5

Answer: Option D