The correct answer is option 3, a writ. A writ is a formal written order issued by a court instructing a person or a public authority to perform a specific action or to refrain from doing a certain act. In the context of enforcing Fundamental Rights, a court can issue different types of writs, such as a writ of habeas corpus, mandamus, prohibition, certiorari, or quo warranto. These writs are intended to safeguard Individual rights and provide a mechanism for the judiciary to protect these rights by compelling the government or other authorities to act in accordance with the Constitution. It is important to note, however, that a court cannot issue a decree (option 1), which is a judgment or decision in a civil case, or an ordinance (option 2), which is a law passed by a legislative body. Option 4, a notification, is also not appropriate as it refers to a form of official communication or announcement.