You have started a new job and are reviewing your company's infrastructure on AWS You notice one web application where they have an Elastic Load Balancer
(&B) in front of web instances in an Auto Scaling Group When you check the metrics for the ELB in CloudWatch you see four healthy instances in Availability Zone
(AZ) A and zero in AZ B There are zero unhealthy instances.
What do you need to fix to balance the instances across AZs?