An e-commerce company has deployed a query-intensive application on the Amazon Aurora cluster. Amazon RDS Proxy is used along with the Amazon Aurora cluster for scalability. Operations teams are getting complaints of delays in reading data from these clusters. You are assigned to analyze and optimize read performance.
Which of the following services can be created for further making read queries scalable?

Answer options:

A.Create a Reader endpoint with RDS proxy having target as Amazon Aurora Cluster primary DB instance.
B.Create a Reader endpoint with RDS proxy having target as Amazon Aurora Cluster reader DB instance.
C.Create a Reader endpoint with RDS proxy having target as single writer Amazon Aurora Cluster.
D.Create a Reader endpoint with RDS proxy having target as multi-writer Amazon Aurora Cluster.

Correct Answer: B
Read-only endpoints called Reader endpoints can be used along with Amazon RDS Proxy with the Amazon Aurora cluster. The application reads data from a particular DB instance with Read Replicas, while Reader endpoints load balances read requests to multiple instances within a cluster. This improves scalability and availability for read operations from reader DB instances & also enhances read performance. While creating Reader endpoints, the target should be set as a reader DB instance of the Aurora cluster. 
Options A, C & D incorrect all these target types are invalid as the target type for the Reader endpoint should be reader DB instance.
For more information on Amazon RDS Proxy & Reader endpoint, refer to the following URLs,
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/rds-proxy.html
https://aws.amazon.com/blogs/aws/new-reader-endpoint-for-amazon-aurora-load-balancing-higher-availability/