单项选择题 A customer wants to install data deduplication and is currently backing up 100 MB of data per night and 300 MB of data per week. They require 100mb/sec of throughput to achieve this backup in their backup window. They have very limited rack space and can only offer 4U space in one of their existing racks. Which ProtecTIER product set best suits this customer?（）

单项选择题 A financial customer has three data centers that are approximately five kilometers apart. Their SAP application data needs to be kept synchronized within 10 milliseconds between the three sites. Which of the following solutions satisfies the customers recovery time objective?（）

单项选择题 A customer needs to achieve a very aggressive RTO of 30 minutes or less. A critical requirement is a continuous availability and disaster recovery solution for the mainframe environment. What IBM solution should be recommended to this customer?（）