The correct answer is option 4: Financial emergency. Two types of emergencies have been declared in India – internal emergency caused due to internal disturbances (option 1) and external emergency caused due to external threats (option 2). These emergencies are declared when there is a threat to the security or stability of the nation. State emergency (option 3) is declared when there is a failure of the constitutional machinery in the states. However, a financial emergency (option 4) has not been declared in India so far. A financial emergency can be declared when the financial stability of the country is at risk, such as a severe economic crisis. It grants the central government the power to take control of the financial resources of the country.