A. Create your RDS instance as part of your Elastic Beanstalk definition and alter its security group to allow access to it from hosts in your application subnets.
B. Create your RDS instance separately and add its IP address to your application’s DB connection strings in your code Alter its security group to allow access to it from hosts within your VPC’s IP address block.
C. Create your RDS instance separately and pass its DNS name to your app’s DB connection string as an environment variable. Create a security group for client machines and add it as a valid source for DB traffic to the security group of the RDS instance itself.
D. Create your RDS instance separately and pass its DNS name to your’s DB connection string as an environment variable Alter its security group to allow access to It from hosts in your application subnets.