Correct option is D
Indian Trade Union Act, 1926: This act was enacted in 1926 and provided for the registration of trade unions in India. It is one of the first pieces of labour legislation meant to regulate trade union activities.
Payment of Wages Act, 1936: Enacted in 1936, this act ensures timely payment of wages without any unauthorised deductions.
Minimum Wages Act, 1948: Passed in 1948, this legislation sets minimum wages for skilled and unskilled laborers in different sectors.
Payment of Gratuity Act, 1972: Introduced in 1972, this law governs the payment of gratuity to employees who have rendered a minimum of five years of continuous service in an organization.