The correct option is 2 (5 years).

As per the Minimum Wages Act, 1948, the appropriate government is required to review or revise the minimum rate of wages at an interval not exceeding five years. This provision ensures that the wages remain fair and relevant, accounting for inflation, changes in the cost of living, and other economic factors. The revision process safeguards the interests of workers by maintaining a reasonable standard of living while aligning with economic conditions. Regular reviews are crucial for promoting equitable wage practices and fostering labor welfare in the workforce.