Which solution will meet these requirements?
Migrate the MySQL database to Amazon RDS for MySQL with a Multi-AZ DB cluster deployment. Use Amazon ElastiCache for Redis with high availability to store session data and to cache reads. Migrate the web server to an Auto Scaling group that is in three Availability Zones.
Migrate the MySQL database to Amazon RDS for MySQL with a Multi-AZ DB cluster deployment. Use Amazon ElastiCache for Memcached with high availability to store session data and to cache reads. Migrate the web server to an Auto Scaling group that is in three Availability Zones.
Migrate the MySQL database to Amazon DynamoDB Use DynamoDB Accelerator (DAX) to cache reads. Store the session data in DynamoDB. Migrate the web server to an Auto Scaling group that is in three Availability Zones.
Migrate the MySQL database to Amazon RDS for MySQL in a single Availability Zone. Use Amazon ElastiCache for Redis with high availability to store session data and to cache reads. Migrate the web server to an Auto Scaling group that is in three Availability Zones.
Explanations:
This option ensures high availability by migrating the MySQL database to Amazon RDS with Multi-AZ deployment, which automatically handles failover. Using Amazon ElastiCache for Redis provides high availability and faster access to session data, while the Auto Scaling group across three Availability Zones ensures the web servers can scale and maintain performance during traffic spikes.
Although this option migrates the MySQL database to Amazon RDS with Multi-AZ and uses ElastiCache for Memcached, Memcached does not provide the same level of data persistence and high availability features as Redis. Therefore, this option does not fully meet the requirement for high availability.
While migrating to DynamoDB provides a fully managed, scalable NoSQL database, it does not align with the original architecture that relies on MySQL. Additionally, managing session data within DynamoDB requires careful design to ensure consistency and performance. Although DAX helps with caching, the fundamental architecture change makes this option less appropriate for the current needs.
This option only deploys the MySQL database in a single Availability Zone, which does not ensure high availability. While it correctly uses ElastiCache for Redis to manage session data and the Auto Scaling group for web servers, the lack of Multi-AZ deployment for the database creates a single point of failure.
I conclude that the answer is:
Migrate the MySQL database to Amazon RDS for MySQL with a Multi-AZ DB cluster deployment. Use Amazon ElastiCache for Redis with high availability to store session data and to cache reads. Migrate the web server to an Auto Scaling group that is in three Availability Zones.