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Which additional services will improve the availability of the application


#1

A Solution Architect has a two-tier application with a single Amazon EC2 instance web server and Amazon RDS MySQL Multi-AZ DB instances. The Architect is re-architecting the application for high availability by adding instances in a second Availability Zone.

Which additional services will improve the availability of the application?

  1. Auto Scaling group
  2. AWS CloudTrail
  3. ELB Classic Load Balancer
  4. Amazon DynamoDB
  5. Amazon ElastiCache