AWS Certified Solutions Architect - Professional (#288)

An organization is setting up a highly scalable application using Elastic Beanstalk. The organization is using ELB and RDS with VPC. The organization has public and private subnets within the cloud. Which of the below mentioned configurations will not work in this scenario?

To setup RDS in a private subnet and ELB in a public subnet.
The configuration must have public and private subnets in the same AZ.
The configuration must have two private subnets in separate AZs.
The EC2 instance should have a public IP assigned to it.