Which of the following remote replication plans can be used in a geo-redundancy disaster recovery solution? (Multiple Choice)

Which of the following remote replication plans can be used in a geo-redundancy disaster recovery solution? (Multiple Choice)
A . Intra-city synchronous remote replication through optical fibers
B . Intra-city synchronous remote replication through IB link
C . Inter-city asynchronous remote replication through IB link
D . Inter-city asynchronous remote replication through Ethernet

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Answer: AD