Q1，A company has amulti-tier applicaton that runs six front-end web servers in an Amazon EC2Auto Scaling group in a single Availability Zone behind an Application LoadBalancer(ALB). A solutions architect needs to modify the infrastructure to behighly available without modifying the application.

Which architecture should the solutions architect choosethat provides high availability?

A. Create an Auto Scaling group that uses three instancesacross each of two Regions.

B. Modify the Auto Scaling group to use three instancesacross each of two Availability Zones.

C. Create an Auto Scaling template that be used to quicklycreate more instances in another Region.

D. Change the ALB in front of the Amazon EC2 instances in around-robin configuration to balance traffic to the web tier.(一家公司拥有一系列层应用程序，在应用程序负载平衡器(ALB)后面的单个可用性区域中，在亚马逊EC2自动缩放组中运行6台前端web服务器。解决方案架构师需要修改基础设施，以使其高度可用，而无需修改应用程序。)

Answer: B