Explanation:

• E.S.I. Scheme being contributory in nature, all the employees in the factories or establishments to which the Act applies shall be insured in a manner provided by the Act.

• The contribution payable to the Corporation in respect of an employee shall comprise of employer's contribution and employee's contribution at a specified rate.

• The rates are revised from time to time. Currently, the employee's contribution rate (w.e.f. 01.07.2019) is 0.75% of the wages and that of employer's is 3.25% of the wages paid/payable in respect of the employees in every wage period.

Hence option 4th is correct.