Solution
Option 1 -> When domestic currency appreciates, fewer units are needed to buy foreign currency, meaning the price of foreign currency decreases.
Option 2 -> Devaluation is a deliberate policy action by authorities to reduce currency value under a fixed exchange rate system.
Option 3 -> Depreciation occurs when domestic currency loses value in a floating system, requiring more units to purchase foreign currency.
Option 4 -> Dirty floating is an exchange rate regime with market-determined rates and occasional intervention, not a description of currency value change.
Hence, Depreciation of domestic currency -> When the exchange rate increases, meaning the price of foreign currency rises in terms of domestic currency (e.g., 1 USD = 70 INR becomes 1 USD = 75 INR), the domestic currency has weakened or depreciated. This means more domestic currency is required to purchase the same amount of foreign currency, indicating a loss in the domestic currency's purchasing power in international markets. This naturally occurs in floating exchange rate systems due to market forces of demand and supply. -> correct