Explanation:

- The Electoral Bonds Scheme was introduced in 2018 to ensure transparent political funding in India.

- Electoral Bonds are instruments to donate to political parties.

- These bonds can be purchased by Indian citizens or entities and then donated to a political party of their choice.

- The validity of these bonds is crucial because they must be encashed by a political party within this period.

- Option: 1 - 15 days represents the correct validity period of Electoral Bonds as per the scheme.

- Option: 2 - 45 days, Option: 3 - 30 days, Option: 4 - 50 days, and Option: 5 - 60 days are incorrect.

- The bonds are intended to be valid for only a short period to minimize misuse and ensure timely accounting and transparency.