Explanation

Correct Answer: B

Why Option B is correct:

1. AWS Elastic Beanstalk is specifically designed for deploying and managing web applications (including Java/Tomcat applications) with minimal infrastructure management.
2. Load-balanced environment ensures high availability by distributing traffic across multiple instances.
3. Rolling deployment policy allows for zero-downtime deployments, maintaining application availability during updates.
4. Elastic Beanstalk automatically handles capacity provisioning, load balancing, auto-scaling, and application health monitoring.
5. For the MySQL database, the architect would typically use Amazon RDS for MySQL (managed database service) which provides high availability, automated backups, and easy scaling.

Why other options are incorrect:

Option A (AWS Lambda):

• Lambda is serverless compute for event-driven applications, not suitable for complex Java applications requiring Apache Tomcat.
• Lambda has limitations on execution time (15 minutes max), memory, and doesn't support traditional Java web application deployment patterns.
• Not designed for long-running applications with persistent connections.

Option C (Amazon ElastiCache):

• ElastiCache is an in-memory caching service (Redis/Memcached), not a relational database replacement for MySQL.
• This option only addresses the database aspect incorrectly and doesn't address the Java/Tomcat application deployment requirements.

Option D (EC2 with manual setup):

• While this could work, it requires significant manual configuration and management.
• Installing MySQL on EC2 instances doesn't provide the same level of high availability, automated backups, and managed services as Amazon RDS.
• The approach is more complex and error-prone compared to using managed services like Elastic Beanstalk and RDS.
• Auto Scaling groups help with availability but don't provide the same level of application management as Elastic Beanstalk.

Key AWS Services for this scenario:

1. AWS Elastic Beanstalk - For deploying and managing the Java/Tomcat application
2. Amazon RDS for MySQL - For the managed MySQL database with high availability
3. Application Load Balancer - For distributing traffic across instances
4. Auto Scaling - For automatically adjusting capacity based on demand

This combination provides a highly available, scalable, and managed solution that meets all requirements with minimal operational overhead.