A customer has a requirement for Disaster Recovery for compliance within their industry. Theyhave an RPO of 4 hours and an RTO of 24 hours. Cost is a consideration. What is the most costeffective DR implementation？（）
A. a disk-to-disk backup solution keeping all storage in the data center
B. a backup solution that includes magnetic tape that is shipped to an off-site storage facility
C. a less powerful copy environment at a hot site with asynchronous mirroring and cluster technology
D. an exact copy of the primary environment at a hot site with remote mirroring and cluster technology
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