Explanation:

- Option 1: Undivision

- Generally refers to reversing a division.

- Not commonly used in legal or financial contexts.

- Option 2: Division

- Usually means separating into parts.

- Relevant in contexts like mathematics or organizational structuring.

- Not related to actionable claims.

- Option 3: Combination

- Means merging different elements into a single one.

- Often used in contexts unrelated to actionable claims like cooking or strategy-making.

- Option 4: Assignment

- Refers to the transfer of rights or property to another party.

- In legal terms, it's the correct term for transferring actionable claims.

Correct Answer: Option 4 - Assignment