Final answer:
In AWS RDS, Creating Read Replicas is the feature designed to reduce the load on the primary database by allowing read-only copies of the database that handle read traffic.
Step-by-step explanation:
The feature in AWS RDS that allows you to reduce the load on the database while reading data is the option of Creating Read Replicas. Read Replicas enable you to have read-only copies of your database instance, which can be used for heavy read traffic and thus decrease the load on your primary database. This is particularly useful for scaling out beyond the constraint of a single database for read-heavy database workloads.
On the other hand, using snapshots in AWS RDS is mainly for backups, the Multi-AZ feature is for high availability and failover support, and cross region replication is used to create additional copies of your database in different AWS regions. Creating Read Replicas is the most direct method to achieve the desired outcome of reducing read load.