A financial customer has three data centers that are four kilometers apart. Their SAP application data needs to be kept synchronized within 10 milliseconds. 
Which solution satisfies the customer’s recovery time objective（）

A customer with a small IT budget has one data center. Their main application is a database  
running on an IBM System Storage DS8000. The database has a data change rate of 50% per day. Once a week， they must do a point-in-time backup from the database to tape. The time it takes to run the backup now exceeds the backup window allowed. The customer requests a proposal to reduce database downtime caused by running backups， with nearly zero impact to production volumes. 
In addition to the tape backup， which DS8000 feature should a technical specialist propose（）

A customer would like to implement an IBM System Storage DS8000 solution that requires 225 TB raw capacity. They are convinced that 450 GB is the optimum size for their business applications. There is limited space available for additional machines in the data center. 
Which solution meets best this requirement（）