To serve Web traffic for a popular product your chief financial officer and IT director have purchased 10 ml large heavy utilization Reserved Instances (RIs) evenly spread across two availability zones: Route 53 is used to deliver the traffic to an Elastic Load Balancer (ELB). After several months, the product grows even more popular and you need additional capacity As a result, your company purchases two C3.2xlarge medium utilization Ris You register the two c3 2xlarge instances with your ELB and quickly find that the ml large instances are at 100% of capacity and the c3 2xlarge instances have significant capacity that's unused Which option is the most cost effective and uses EC2 capacity most effectively?

A. Use a separate ELB for each instance type and distribute load to ELBs with Route 53 weighted round robin
B. Configure Autoscaning group and Launch Configuration with ELB to add up to 10 more on-demand mi large
instances when triggered by Cloudwatch shut off c3 2xiarge instances
C. Route traffic to EC2 ml large and c3 2xlarge instances directly using Route 53 latency based routing and
health checks shut off ELB
D. Configure ELB with two c3 2xiarge Instances and use on-demand Autoscailng group for up to two additional c3.2xlarge instances Shut on mi .large instances.

Answer: D. Configure ELB with two c3 2xiarge Instances and use on-demand Autoscailng group for up to two additional c3.2xlarge instances Shut on mi .large instances.