Step 1: Recall the Constitution's character:
The Indian Constitution is federal in structure (division of powers between Centre and States) yet has unitary features (single citizenship, a strong Centre, emergency provisions), and is one of the most detailed/comprehensive constitutions in the world (originally 395 Articles, 8 Schedules).
Step 2: Combine the features:
Because it genuinely displays federal, quasi-unitary and highly detailed characteristics simultaneously, all three listed features apply.
Final Answer:
\[ \boxed{\text{All of the above}} \]