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A company is moving a stateful web application from one public EC2 instance. The new design must survive an instance or Availability Zone failure and keep the database private. Which architecture best meets the requirement?

Use an internet-facing ALB across two public subnets, an Auto Scaling group of private EC2 instances across two AZs, and RDS Multi-AZ in private database subnets.Place one larger EC2 instance and the database in a public subnet and create nightly snapshots.Use two public EC2 instances with DNS round robin and store uploads on each instance volume.Use a NAT Gateway as the public application entrance and keep one EC2 instance private.