Which system provides 'Strict Serializability'?

1. A A system that guarantees transactions are executed in a serial order while ensuring that this order respects wall-clock recency.
2. B A specialized consistency model that allows for Stale Reads but strictly enforces the order of all incoming Monotonic Writes.
3. C The default consistency level provided by Cassandra when performing Quorum-based Read and Write operations across multiple regions.
4. D Any database that utilizes Snapshot Isolation to prevent dirty reads while allowing for concurrent transaction execution.