Explanation:

- Option 1: National Family Benefit Scheme (NFBS)

- This is a social security scheme for providing a one-time financial assistance to poor families upon the death of the primary breadwinner.

- It supports the unorganized workers' category to secure their family's future in case of any sudden income loss.

- Option 2: Janshree Bima Yojana

- An insurance scheme aimed at providing social security to low-income groups through affordable premiums.

- Designed for unorganized sector workers, it offers benefits like life insurance coverage.

- Option 3: Employees' Pension Scheme

- Primarily for the organized workforce covered under the Employees’ Provident Fund Organization (EPFO).

- It is not specific to unorganized workers, thus not under the Unorganised Workers' Social Security Act.

- Option 4: Rashtriya Swasthya Bima Yojana (RSBY)

- A health insurance scheme for families below the poverty line (BPL).

- Provides hospitalization coverage to unorganized workers.

The correct answer is Option 3: Employees' Pension Scheme.