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Question 17

An Internet-facing multi-tier web application must be highly available. An ELB Classic Load Balancer is deployed in front of the web tier. Amazon EC2 instances at the web application tier are deployed evenly across two Availability Zones. The database is deployed using RDS Multi-AZ. A NAT instance is launched for AmazonEC2 instances and database resources to access the Internet. These instances are not assigned with public IP addresses.Which component poses a potential single point of failure in this architecture?

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