Suppose there are two countries - country P and country Q. Country P manipulated its exchange rate against the interest of country Q. This will be called as?

Dirty floating exchange rate

The correct answer is Option 4: Dirty floating exchange rate

When a country manipulates its exchange rate in a way that affects another country's economic interests, this is often referred to as "dirty floating" or "managed floating" if the manipulation involves interventions by the government or central bank.

Dirty floating specifically refers to a situation where a country occasionally intervenes in the foreign exchange market to influence its currency's value, sometimes in a way that can be detrimental to other countries.

Managed floating also involves government intervention but is typically a broader term and not necessarily focused on detrimental effects to other countries.