Amazon AWS Certified Solutions Architect Associate 2018 Set 2

A Solutions Architect is designing a stateful web application that will run for one year (24/7) and then be decommissioned. Load on this platform will be constant, using a number of r4.8xlarge instances. Key drivers for this system include high availability, but elastically is not required. What is the MOST cost-effective way to purchase compute for this platform?

A Solutions Architect is designing a VPC. Instances in a private subnet must be able to establish IPv6 traffic to the Internet. The design must scale automatically and not incur any additional cost. This can be accomplished with:

A web application stores all data in an Amazon RDS Aurora database instance. A Solutions Architect wants to provide access to the data for a detailed report for the Marketing team, but is concerned that the additional load on the database will affect the performance of the web application. How can the report be created without affecting the performance of the application?

A company has an application that stores sensitive data. The company is required by government regulations to store multiple copies of its data. What would be the MOST resilient and cost-effective option to meet this requirement?

A Solutions Architect is designing the storage layer for a production relational database. The database will run on Amazon EC2. The database is accessed by an application that performs intensive reads and writes, so the database requires the LOWEST random I/O latency. Which data storage method fulfills the above requirements?