Explanation:

- Option 1: Savings + Taxes + Imports = Investment + Govt. Expenditure + Exports. This describes the balance between leaks from the economy and the injections into it, essential for equilibrium in an open economy.

- Option 2: Total Leakages = Total Injections. This represents a general condition for equilibrium in an economy. Leakages (savings, taxes, imports) should equal injections (investment, government spending, exports) for balance.

- Option 3: Aggregate Output = Aggregate Expenditure. This implies that what an economy produces must equal what is spent, ensuring equilibrium.

- Option 4: All of these. All the statements described align with equilibrium conditions in an open economy.

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