A. Set up each EC2 instance so that it writes its healthy/unhealthy status into a shared Amazon S3 bucket for the ALB to read.
B. Configure the health check on the ALB and ensure that the Health Check Path setting is correct.
C. Set up Amazon ElastiCache to track the EC2 instances as they scale in and out.
D. Configure an Amazon API Gateway health check to ensure custom checks on all of the EC2 instances.

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