You have an AWS RDS PostgreSQL database hosted in the Singapore region. You need to ensure that the database is asynchronously copied to another one that can also share the read workload. What would be helpful to fulfill this requirement?

Answer options:

A.Enable Multi-AZ for the database
B.Enable Read Replicas for the database
C.Enable Asynchronous replication for the database
D.Enable manual backups for the database

Correct Answer – B
AWS Documentation mentions the following.
Amazon RDS Read Replicas enable you to create one or more read-only copies of your database instance within the same AWS Region or in a different AWS Region. Updates made to the source database are then asynchronously copied to your Read Replicas. In addition to providing scalability for read-heavy workloads, Read Replicas can be promoted to become a standalone database instance when needed. 
For more information on Read Replicas, please visit the following URL-
https://aws.amazon.com/rds/details/read-replicas/
Note: 
When you enable Multi-AZ for the database, you enable synchronous replication rather than asynchronous replication mentioned in the question.
When you create a Read Replica, you first specify an existing DB instance as the source. Then Amazon RDS takes a snapshot of the source instance and creates a read-only instance from the snapshot. Amazon RDS then uses the asynchronous replication method for the DB engine to update the Read Replica whenever there is a change to the source DB instance. 
You can use the Read Replica promotion as a data recovery scheme if the source DB instance fails.
For more information, please click the link given below.
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_ReadRepl.html