Explanation:

- The word "Occupied" typically means that something is being used or filled, not available for use by someone else.

- Option 1: Late - This means occurring after the expected or usual time. It is unrelated to the concept of being occupied.

- Option 2: Free - This means not being used or taken, available. It is the opposite of occupied.

- Option 3: Vast - This means very large or extensive. It doesn't relate directly to being occupied or not.

- Option 4: New - This means being recently made or introduced. It does not serve as an antonym for occupied.