Explanation:

The classification of expenditure into Plan and Non-Plan was used in the Union Budget until the fiscal year 2016-17. However, from the fiscal year 2017-18 onwards, the distinction between Plan and Non-Plan expenditure was eliminated. Instead, the budget classification was changed to Revenue and Capital expenditure.

That being said, if we consider the old classification:

Non-Plan Expenditure included items like:

1. Defence expenditure
2. Interest payments
3. Salaries and pensions
4. Subsidies

So, all the options (1, 2, 3, and 4) would be covered under Non-Plan Expenditure based on the old classification system.