The correct answer is option 4, fundamental rights. The Constitution of India grants certain fundamental rights to its citizens, which are enforceable in the court of law. These include rights such as the right to equality, right to freedom of speech and expression, right to life and personal liberty, right to freedom of religion, and so on. These fundamental rights are considered to be the cornerstone of Indian democracy and provide protection and safeguard against any infringement of these rights by the state or any other authority. The Constitution also provides for remedies and a mechanism to approach the courts in case of any violation of these fundamental rights. It is important to note that while directive principles, preamble, and fundamental duties are integral parts of the Constitution, they are not directly enforceable in the court of law.