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Hello KitKwok12,
Thanks for your feedback.
There are actually two answers to this question.
The correct answer that suggests ‘storing static contents in Amazon S3’ does not imply moving the entire application stack to S3. What it does is offload the requests that the application server would otherwise have processed. Instead, static assets, such as images, fonts are loaded from CloudFront. This will result in a reduced latency between the users and application.
The other correct answer is what truly increases the reliability and availability of the application server: Create an Auto Scaling of Amazon EC2 instances spread in two Availability Zones to host the web servers. Use an Amazon Aurora for MySQL with Multi-AZ enabled as the database.
Let me know if this helps