Which of the following are the principles of scientific management?
1. Different piece rate plan
2. Equal pay for all
3. Cooperation between managers and workers
4. Standardisation of tools and machines
5. Scientific selection of workman

A. 1, 2 and 5

B. 2, 3 and 5

C. 1, 3, 4 and 5

D. 1, 2 and 3

Answer: Option C