Corporation Bank, Dena Bank, and Vijaya Bank are all nationalized banks in India. These institutions are owned and managed by the government, which means that their operations and policies are regulated by the government. This setup provides certain assurances to customers, such as stability and safety for their deposits.

On the other hand, Federal Bank is not a nationalized bank; it is a private sector bank. Unlike nationalized banks, private banks are owned, controlled and managed by private business entities rather than the government. These banks are typically profit-driven and often operate through a network of branches that are strategically located to attract a large customer base. They often offer more competitive services and products compared to their nationalized counterparts. Therefore, the correct answer is option 3, Federal Bank.