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A 3-tier e-commerce web application is current deployed on-premises and will be migrated to AWS for greater
scalability and elasticity The web server currently shares read-only data using a network distributed file system
The app server tier uses a clustering mechanism for discovery and shared session state that depends on IP
multicast The database tier uses shared-storage clustering to provide database fall over capability, and uses
several read slaves for scaling Data on all servers and the distributed file system directory is backed up weekly
to off-site tapes. Which AWS storage and database architecture meets the requirements of the application?

A.
Web servers store read-only data in S3, and copy from S3 to root volume at boot time. App servers share
state using a combination of DynamoDB and IP unicast. Database use RDS with multi-AZ deployment and
one or more Read Replicas. Backup web and app servers backed up weekly via AMIs, database backed up
via DB snapshots.

B.
Web servers store -read-only data in S3, and copy from S3 to root volume at boot time App servers share
state using a combination of DynamoDB and IP unicast Database, use RDS with multi-AZ deployment and
one or more read replicas Backup web servers app servers, and database backed up weekly to Glacier
using snapshots.

C.
Web servers store read-only data In S3 and copy from S3 to root volume at boot time App servers share
state using a combination of DynamoDB and IP unicast Database use RDS with multi-AZ deployment
Backup web and app servers backed up weekly via AM is. Database backed up via DB snapshots.

D.
Web servers, store read-only data in an EC2 NFS server, mount to each web server at boot time App
servers share state using a combination of DynamoDB and IP multicast Database use RDS with multi-AZ
deployment and one or more Read Replicas Backup web and app servers backed up weekly via AMIs
database backed up via DB snapshots

Explanation:
https://d0.awsstatic.com/whitepapers/Storage/AWS%20Storage%20Services%20Whitepaper-v9.pdf Amazon
Glacier doesn’t suit all storage situations. Listed following are a few storage needs for which you should
consider other AWS storage options instead of Amazon Glacier.Data that must be updated very frequently might be better served by a storage solution with lower read/write
latencies, such as Amazon EBS, Amazon RDS, Amazon DynamoDB, or relational databases running on EC2.

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