A company requires an RPO of less than 10 seconds to ensure business continuity.

C (Synchronous replication across data centers):Synchronous replication ensures zero or near-zero data loss (very low RPO), as data is written simultaneously to both sites. For an RPO of under 10 seconds, synchronous replication is mandatory.

Other options explained:

A: Asynchronous replication may result in higher RPO.

B/D: Single site designs introduce single points of failure for business continuity.