A user wants to achieve High Availability with PostgreSQL DB. Which of the below mentioned functionalities helps achieve
HA?

A.
Read Replica

B.
Multi AZ

C.
Multi region

D.
PostgreSQL does not support HA

Explanation:
The Multi AZ feature allows the user to achieve High Availability. For Multi AZ, Amazon RDS automatically provisions
and maintains a synchronous “standby” replica in a different Availability Zone.
http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Welcome.html