A company runs an application in the cloud that consists of a database and a website. Users can post data to the website, have the data processed, and have the data sent back to them in an email. Data

Placing the Tomcat server in an Auto Scaling group with multiple EC2 instances behind an Application Load Balancer distributes traffic, handles increased load, and provides high availability for the website component.

Provisioning an additional VPC peering connection does not directly address the reliability issues of the single EC2 instances or the database; a single peering connection is sufficient for connectivity.

Migrating the MySQL database to Amazon Aurora with an Aurora Replica improves database reliability, scalability, and availability by moving from a single EC2 instance database to a managed, fault-tolerant, and read-replica capable service.

Provisioning two NAT gateways in the database VPC is relevant for instances in private subnets needing outbound internet access, but it doesn't solve the core reliability issues of the website or the database itself in this scenario.

Moving the Tomcat server to the database VPC might simplify networking but doesn't inherently increase reliability if it remains a single instance or if the database is still a single point of failure; it doesn't address the scaling and high availability requirements.

Creating an additional public subnet in a different Availability Zone in the website VPC allows for deploying the load balancer and Auto Scaling group instances across multiple AZs, enhancing fault tolerance and high availability for the website.