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A company deployed a three-tier web application in a single Availability Zone in the us-east-1...

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A company deployed a three-tier web application in a single Availability Zone in the us-east-1 Region on a single Amazon EC2 instance. Usage of the application is growing.

A solutions architect needs to ensure that the application can handle the growing amount of traffic and that the application is resilient. The solution must be cost-effective.

Which solution will meet these requirements MOST cost-effectively?

A.

Create two additional EC2 instances spread across two separate Availability Zones. Create an Application Load Balancer (ALB). Configure the ALB to route traffic to a target group that contains all three instances. Create an Amazon CloudWatch alarm to scale the EC2 instances vertically to handle the application traffic.

B.

Create eight additional EC2 instances spread across three separate Availability Zones. Create an Application Load Balancer (ALB). Configure the ALB to route traffic to a target group that contains all nine instances. Create an Amazon CloudWatch alarm to scale the EC2 instances horizontally to handle the application traffic.

C.

Create an EC2 Auto Scaling group that contains a minimum of three EC2 instances in the same Availability Zone. Create an Application Load Balancer (ALB). Configure the ALB to route traffic to a target group that contains all the instances. Configure scheduled scaling for the Auto Scaling group.

D.

Create an EC2 Auto Scaling group that contains a minimum of three EC2 instances spread across Availability Zones. Create an Application Load Balancer (ALB). Configure the ALB to route traffic to a target group that contains all the instances. Create an Amazon CloudWatch alarm to scale the EC2 instances horizontally to handle the application traffic.

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