Explanation:

- Option 1: Investment receipts

Investment receipts are not typically a term used to describe a component of the capital budget.

- Option 2: Capital receipts

These involve money received that creates a liability or reduces financial assets. Examples include loans, disinvestment, and recovery of loans. They form one part of the capital budget.

- Option 3: Expenditure receipts

This term is misleading. Receipts typically refer to income, while expenditures refer to spending.

- Option 4: Revenue receipts

These are part of the government's revenue budget, including tax and non-tax revenue, but not the capital budget.

In short, the capital budget consists of capital receipts and capital expenditure, making option 2 correct.