Match the Artists and their Art form: 
| a. Amrita Shergill | 3. Painting |
| b. T. Swaminathan Pillai | 1. Flute |
| c. Kalamandalam Krishnan Nair | 2. Kathakali |
| d. Padma Subramanian | 4. Bharatanatyam |
The DDR&D deals with research and development of defence technologies, systems, and equipment. DDR&D stands for:
What is 'X' in the following table?