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Your company hosts a social media site supporting users in multiple countries. You have been asked to provide
a highly available design tor the application that leverages multiple regions tor the most recently accessed
content and latency sensitive portions of the wet) site The most latency sensitive component of the application
involves reading user preferences to support web site personalization and ad selection.
In addition to running your application in multiple regions, which option will support this application’s
requirements?

A.
Serve user content from S3. CloudFront and use Route53 latency-based routing between ELBs in each
region Retrieve user preferences from a local DynamoDB table in each region and leverage SQS to capture
changes to user preferences with SOS workers for propagating updates to each table.

B.
Use the S3 Copy API to copy recently accessed content to multiple regions and serve user content from S3.
CloudFront with dynamic content and an ELB in each region Retrieve user preferences from an
ElasticCache cluster in each region and leverage SNS notifications to propagate user preference changes
to a worker node in each region.

C.
Use the S3 Copy API to copy recently accessed content to multiple regions and serve user content from S3
CloudFront and Route53 latency-based routing Between ELBs In each region Retrieve user preferencesfrom a DynamoDB table and leverage SQS to capture changes to user preferences with SOS workers for
propagating DynamoDB updates.

D.
Serve user content from S3. CloudFront with dynamic content, and an ELB in each region Retrieve user
preferences from an ElastiCache cluster in each region and leverage Simple Workflow (SWF) to manage
the propagation of user preferences from a centralized OB to each ElastiCache cluster.

Explanation:
http://media.amazonwebservices.com/architecturecenter/AWS_ac_ra_mediasharing_09.pdf http://
media.amazonwebservices.com/architecturecenter/AWS_ac_ra_adserving_06.pdf

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