AWS认证SAA-C03每日一题

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【SAA-C03助理级解决方案架构师认证】

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 ActiveMQserver 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 B 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.