Which architecture should the solutions architect choose that provides high availability?

A company has a multi-tier application that runs six front-end web servers in an Amazon EC2 Auto Scaling group in a single Availability Zone behind an Application Load Balancer (ALB) A solutions architect needs to modify the infrastructure to be highly available without modifying the application

Which architecture should the solutions architect choose that provides high availability?
A . Create an Auto Scaling group that uses three instances across each of two Regions
B . Modify the Auto Scaling group to use three instances across each of two Availability Zones
C . Create an Auto Scaling template that can be used to quickly create more instances in another Region
D . Change the ALB in front of the Amazon EC2 instances in a round-robin configuration to balance traffic to the web tier

View Answer

Answer: B

Explanation:

https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-add-availability-zone.html