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A development team has inherited a web application running in the us-east-1 region with three availability zones (us-east-1a, us-east1-b, and us-east-1c) whose incoming web traffic is routed by a load balancer. When one of the EC2 instances hosting the web application crashes, the team realizes that the load balancer continues to route traffic to that instance causing intermittent issues. Which of the following should the development team do to minimize this problem?