Explanation:

- When dealing with the transfer of immovable property, documentation is typically required.

- However, an exception exists for properties of low value.

- Option 1: A document is not necessary if the property's value is less than Rs. 1000.

- Option 2: If the value is less than Rs. 10000, documentation might still be necessary.

- Option 3: If the value is less than Rs. 100, a document is not necessary.

- Option 4: Less than Rs. 100000 still requires documentation.

Your answer, Option 3, is indeed the correct one.