单选题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？（）Aa disk-to-disk backup solution keeping all storage in the data centerBa backup solution that includes magnetic tape that is shipped to an off-site storage facilityCa less powerful copy environment at a hot site with asynchronous mirroring and cluster technologyDan exact copy of the primary environment at a hot site with remote mirroring and cluster technology
单选题
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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