The storage specialist sized a DS8800 proposal with eight host adapters in the four-port version. 240 drives of the 146GB-15k rpm type will be installed. The proposal needs to meet a very competitive price. The customer will have only minor capacity growth in the future. 
Which of the following solutions best meets these requirements（）

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（）