Which of the design patterns below should they use?

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A company is building a voting system for a popular TV show, viewers win watch the
performances then visit the show’s website to vote for their favorite performer. It is expected
that in a short period of time after the show has finished the site will receive millions of
visitors. The visitors will first login to the site using their Amazon.com credentials and then
submit their vote. After the voting is completed the page will display the vote totals. The
company needs to build the site such that can handle the rapid influx of traffic while
maintaining good performance but also wants to keep costs to a minimum. Which of the
design patterns below should they use?

A.
Use CloudFront and an Elastic Load balancer in front of an auto-scaled set of web servers, the
web servers will first can the Login With Amazon service to authenticate the user then process
the users vote and store the result into a multi-AZ Relational Database Service instance.

B.
Use CloudFront and the static website hosting feature of S3 with the Javascript SDK to call the
Login With Amazon service to authenticate the user, use IAM Roles to gain permissions to a
DynamoDB table to store the users vote.

C.
Use CloudFront and an Elastic Load Balancer in front of an auto-scaled set of web servers, the
web servers will first call the Login with Amazon service to authenticate the user, the web servers
will process the users vote and store the result into a DynamoDB table using IAM Roles for EC2
instances to gain permissions to the DynamoDB table.

D.
Use CloudFront and an Elastic Load Balancer in front of an auto-scaled set of web servers, the
web servers will first call the Login. With Amazon service to authenticate the user, the web
servers win process the users vote and store the result into an SQS queue using IAM Roles for
EC2 Instances to gain permissions to the SQS queue.
A set of application servers will then retrieve the items from the queue and store the result into a
DynamoDB table.

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