Explanation:

- The Union Budget 2018-19 was not paperless. Traditional printed copies were used.

- The Union Budget 2019-20 followed the conventional approach with printed documents.

- The Union Budget 2020-21 was also not fully paperless, though there was some use of digital methods due to COVID.

- Union Budget 2021-22: This was India’s first paperless budget. Presented by Finance Minister Nirmala Sitharaman, it used a digital format, primarily due to the pandemic, to promote a contactless approach.