Explanation:

- National Bank for Agriculture and Rural Development (NABARD) was established to foster rural development and to improve the financial structure for agriculture in India.

- *Option 1: 1984* - Incorrect. NABARD was not set up in this year.

- *Option 2: 1983* - Incorrect. NABARD was established before this year.

- Option 3: 1982 - Correct. NABARD was officially set up on July 12, 1982.

- *Option 4: 1981* - Incorrect. The idea was formulated around this time, but the institution was not yet set up.