A company is running three production web server reserved EC2 instances with EBS-backed root volumes. These instances have a consistent CPU load of 80%. Traffic is being distributed to these instances by an Elastic Load Balancer. They also have their corresponding production and development Multi-AZ RDS MySQL databases. What recommendation would you make to reduce cost in this environment without affecting availability of mission-critical systems? Choose the correct answer from the options given below

Answer options:

A.Consider using on-demand instances instead of reserved EC2 instances
B.Consider not using a Multi-AZ RDS deployment for the development database
C.Consider using spot instances instead of reserved EC2 instances
D.Consider removing the Elastic Load Balancer

Answer – B
Multi-AZ databases is better for production environments rather than for development environments, so you can reduce costs by not using this for development environments
Amazon RDS Multi-AZ deployments provide enhanced availability and durability for Database (DB) Instances, making them a natural fit for production database workloads. When you provision a Multi-AZ DB Instance, Amazon RDS automatically creates a primary DB Instance and synchronously replicates the data to a standby instance in a different Availability Zone (AZ). Each AZ runs on its own physically distinct, independent infrastructure, and is engineered to be highly reliable. In case of an infrastructure failure, Amazon RDS performs an automatic failover to the standby (or to a read replica in the case of Amazon Aurora), so that you can resume database operations as soon as the failover is complete. Since the endpoint for your DB Instance remains the same after a failover, your application can resume database operation without the need for manual administrative intervention
For more information on Multi-AZ RDS, please refer to the below link:
https://aws.amazon.com/rds/details/multi-az/