Explanation:

- The Factories Act, 1948:

- Defines 'worker' and covers those employed directly or through agency.

- Does not expressly exclude 'out-worker' from 'workman'.

- The Plantations Labour Act, 1951:

- Defines 'worker' to include those employed in a plantation, but does not expressly exclude 'out-worker'.

- The Contract Labour (Regulation and Abolition) Act, 1970:

- Defines 'workman' but explicitly excludes an 'out-worker.'

- An 'out-worker' is defined as a person to whom an employer delivers materials for manufacturing at home or elsewhere, not under the immediate supervision of the employer.

- Correct Answer

- The Inter-State Migrant Workmen (Regulation of Employment and Conditions of Service) Act, 1979:

- Covers inter-state migrant workmen but does not specifically exclude 'out-worker' in its definition of workman.