Which statement about finalization in cross-subnet calls is true?

• A. Finalization is determined by a central authority.
• B. Finalization depends solely on the sender subnet.
• C. Finalization depends solely on the recipient subnet.
• D. Finalization is according to each involved subnet's own finality rules.

Answer: (D)

Finality in cross-subnet calls is handled by each subnet using its own rules. In Avalanche, finality isn’t decided by a single central authority or by one party alone. Each subnet has its own consensus process, validator set, and finality conditions, and a cross-subnet operation is considered finalized according to the rules of every subnet it touches. This means you can’t rely on one side to determine finality for the entire cross-subnet action; the source and destination subnets each apply their own finality criteria to the state they control. That’s why the statement that finalization follows each involved subnet’s own finality rules is the best description.