Consider the following events and arrange these in correct chronological order starting from the earliest to the last activity:
I. Dadra and Nagar Haveli as a union territory.
II. Adding Tenth Schedule (anti-defection).
III. Includes "Sindhi" language in the list of official languages in the Eighth Schedule.
IV. Sikkim was made a full-fledged state.
Select the correct answer from the code given below: