Which of the following data replication methods provides the shortest RPO?

Asynchronous replication writes data to the primary site first and then to the secondary site with a delay, which means there could be some data loss (a non-zero RPO) if the primary fails before the data is replicated.

Full replication refers to copying all data, typically as part of a backup, and does not directly describe a continuous replication method for achieving a short RPO.

Synchronous replication ensures that data is written to the secondary site immediately after being written to the primary site, making the RPO very close to zero as no data is lost between writes. This method guarantees high data consistency across replicated copies.

Incremental replication copies only the data that has changed since the last backup, which is a backup strategy and not a continuous real-time data replication method optimized for the shortest RPO.