The Cabinet Secretariat in India has two primary functions.

Option 1 states one function correctly: "To ensure interministerial coordination". The Cabinet Secretariat helps in coordinating between different ministries and departments of the Government of India to ensure smooth functioning.

Next, option 2: "management of major crisis situations in the country" is also accurate. The Cabinet Secretariat plays a vital role in controlling the management of crisis situations, ensuring that the government`s response is well-coordinated, effective, and timely.

Since both options are correct, option 3 "both 1 and 2" is the correct answer.

Option 4, "Neither 1 nor 2", is marked as incorrect because both functions mentioned are true and are carried out by the Cabinet Secretariat.