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?（）
A. Metro Mirror
B. Metro\/Global Mirror
C. Geographically Dispersed Open Servers (GDOS)
D. Geographically Dispersed ParallelSysplex (GDPS)
参考答案：D
