The Indian judicial system is based on:

single integrated system

The correct answer is Option 4 - single integrated system

The Indian judicial system is based on a single integrated system.

Here's why the other options are incorrect:

Dual court system: This system exists in countries like the United States, where there are federal and state courts. India has a unified court system with the Supreme Court at the top.
Multiple court system: This is a broad term, but a single integrated system can also be considered a type of multiple court system with different levels of courts. However, the key point is the unified structure, not the number of courts.
Both integrated and dual system: This is not the case for India. The system is designed to ensure uniformity in the application of laws across the country.