Explanation:

- Option 1: Alienable

- A right that can be transferred or sold to someone else.

- Generally, future maintenance rights are personal and not usually sold or transferred.

- Option 2: Inalienable

- A right that cannot be transferred or sold.

- Future maintenance rights are personal and are meant for the individual's welfare, making them inalienable.

- Correct Answer

- Option 3: Transferrable

- Similar to alienable, but typically used in broader contexts.

- These rights usually can't be passed to others.

- Option 4: Nontransferrable

- Cannot be passed to another person.

- Often applies to personal or specific rights like future maintenance.