Explanation:

The Atal Pension Yojana (APY) is a government-initiated pension scheme aimed at providing a stable income post-retirement for individuals, especially the unorganized sector:

- The scheme is designed to encourage workers to save for retirement and ensures a minimum guaranteed pension.

- Option 2: 18 years and 40 years respectively - This is the correct age range. Subscribers can join the APY between 18 and 40 years of age, allowing them to contribute for a minimum of 20 years to gain pension benefits. Correct Answer

- Option 1: 21 years and 58 years respectively - Not applicable as it falls outside the official limits.

- Option 3: 18 years and 50 years respectively - Exceeds the maximum join age limit.

- Option 4: 21 years and 60 years respectively - Also not applicable within APY limits.