The case study "Ways to increase labour productivity" highlights the hierarchy of ways to increase labour productivity listed below: 1. Increasing emphasis on management techniques; 2. Increased concern for the training of workers; 3. Inflation control actions;

4. Stimulation and financing of research by the government; 5. Government incentives and capital investments; 6. Reducing the power of trade unions. Indicate which of the following combinations represent the hierarchy of the first 3 ways to increase labor productivity. a. 1-2-3; b. 3-4-5; c. 3-1-6; d. 2-4-5; e. 2-1-3.