During the reign of Shivaji in medieval India, the official called `Chitnis` had the role of assisting the king with his correspondence. This means that the Chitnis was responsible for managing and organizing the king`s official communication, including letters, documents, and administrative paperwork. The Chitnis would help the king in drafting, reading, and replying to official correspondence, ensuring that all communication was attended to in an efficient and timely manner.

Option 1, which suggests that the Chitnis was in charge of the king`s personal security guard, is incorrect. The role of the Chitnis was primarily focused on administrative tasks related to correspondence, rather than security.

Option 2, which suggests that the Chitnis was in charge of intelligence/espionage activity, is also incorrect. While intelligence work was important during that time, it was not the specific responsibility of the Chitnis.

Option 3, which suggests that the Chitnis was the master of ceremonies in the royal court, is also incorrect. The Chitnis had a more administrative role and was not directly involved in managing royal court events and ceremonies.

Therefore, the correct answer is option 4, as the Chitnis played a crucial role in assisting the king with his correspondence