Which of the following options can the solutions architect design to create a comprehensive solution for this customer that meets the disaster recovery requirements?

An online e-commerce business is running a workload on AWS. The application architecture includes a web tier, an application tier for business logic, and a database tier for user and transactional data management. The database server has a 100 GB memory requirement. The business requires cost-efficient disaster recovery for the application with an RTO of 5 minutes and an RPO of 1 hour. The business also has a regulatory requirement for out-of-region disaster recovery with a minimum distance between the primary and alternate sites of 250 miles.

Which of the following options can the solutions architect design to create a comprehensive solution for this customer that meets the disaster recovery requirements?
A . Back up the application and database data frequently and copy them to Amazon S3. Replicate the backups using S3 cross-region replication, and use AWS Cloud Formation to instantiate infrastructure for disaster recovery and restore data from Amazon S3.
B . Employ a pilot light environment in which the primary database is configured with mirroring to build a standby database on m4.large in Ihe alternate region. Use AWS Cloud Formation to instantiate the web servers, application servers, and load balancers in case of a disaster to bring the application up in the alternate region. Vertically resize the database to meet the full production demands, and use Amazon Route 53 to switch traffic to the alternate region.
C . Use a scaled-down version of the fully functional production environment in the alternate region that includes one instance of the web server, one instance of the application server, and a replicated instance of the database server in standby mode. Place the web and the application tiers in an Auto Scaling group behind a load balancer, which can automatically scale when the load arrives to the application. Use Amazon Route 53 to switch traffic to the alternate region,
D . Employ a multi-region solution with fully functional web. application, and database tiers in both regions with equivalent capacity. Activate the primary database in one region only and the standby database in the other region. Use Amazon Route 53 to automatically switch traffic from one region to another using health check routing policies.

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Answer: B

Explanation:

The reasons for this scheme are as follows:

Cost efficiency: Minimize costs when no disaster occurs by maintaining a small-scale environment (pilot light) while ensuring rapid service recovery in the event of a disaster.

Rapid recovery (RTO of 5 minutes): AWS CloudFormation enables you to quickly instantiate the necessary infrastructure and quickly switch over with database mirroring to meet recovery time objectives in less than 5 minutes.

Data protection (RPO of 1 hour): Database mirroring ensures that changes in data within one hour are replicated to the standby region to meet the recovery point objective of one hour.

Cross-region disaster recovery: Ensures application availability in the event of a regional issue by deploying a standby environment in another region that is at least 250 miles away from regulatory requirements.