Which architecture offers the HIGHEST availability?

A company recently migrated a message processing system to AWS. The system receives messages into an ActiveMQ queue running on an Amazon EC2 instance. Messages are processed by a consumer application running on Amazon EC2. The consumer application processes the messages and writes results to a MySQL database running on Amazon EC2. The company wants this application to be highly available with low operational complexity

Which architecture offers the HIGHEST availability?
A . Add a second ActiveMQ server to another Availability Zone Add an additional consumer EC2 instance in another Availability Zone Replicate the MySQL database to another Availability Zone.
B . Use Amazon MQ with active/standby brokers configured across two Availability Zones Add an additional consumer EC2 instance in another Availability Zone. Replicate the MySQL database to another Availability Zone
C . Use Amazon MQ with active/standby brokers configured across two Availability Zones. Add an additional consumer EC2 instance in another Availability Zone. Use Amazon RDS for MySQL with Multi-AZ enabled
D . Use Amazon MQ with active/standby brokers configured across two Availability Zones Add an Auto Scaling group for the consumer EC2 instances across two Availability Zones Use
Amazon RDS for MySQL with Multi-AZ enabled.

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Answer: D