The correct answer is option 3: the Supreme Court and High Courts only.

In the Indian judicial system, writs are orders issued by courts to ensure that the law is being correctly implemented and followed. Writs are a powerful tool for safeguarding individual rights and are typically used to address violations of fundamental rights.

Writs can be issued by both the Supreme Court and the High Courts. The Supreme Court is the highest judicial authority in India and can issue writs to enforce fundamental rights across the country. On the other hand, High Courts, which are the highest judicial authorities at the state level, can issue writs for the enforcement of fundamental rights within their respective states.

Lower courts, such as district courts or magistrate courts, do not have the power to issue writs. They primarily handle cases at a local level and do not have jurisdiction over matters related to the enforcement of fundamental rights.

Therefore, option 3 is the correct answer as both the Supreme Court and High Courts can issue writs in the Indian judicial system.