What does 'Eventual Consistency' mean?

1. A A condition where the data across all nodes will never achieve a synchronized or consistent state.
2. B The guarantee that if no fresh updates are made to a key, all subsequent reads will eventually return identical values.
3. C A policy where the database is only required to maintain consistency during specific maintenance windows.
4. D A model where write operations are strictly synchronous, while read operations are processed asynchronously.