A team needs to read-scale a write-heavy PostgreSQL database by routing SELECT queries to replicas. Which feature enables this?

1. A Zone-redundant HA standby
2. ✓ B Read replicas (up to 5 per primary) (correct answer)
3. C Citus sharding
4. D Connection pooling

Shortcut: Read replicas are asynchronous copies that can serve read workloads. Applications route read queries to replica endpoints, offloading the primary for writes.