The correct answer is option 4: 12.

The Constitution of India contains a total of 12 schedules. Schedules are lists or appendices attached to the main body of the Constitution that provide additional details and instructions. Each schedule covers a specific topic or subject. These schedules cover various aspects such as the allocation of seats in the Council of States (schedule 1), the salaries and allowances of the President, Governors, Judges, etc. (schedule 2), the forms of oaths and affirmations (schedule 3), and the languages recognized by the Indian Constitution (schedule 8), among others. Each schedule serves an important purpose in the functioning and administration of the Indian government.