From a disaster recovery perspective, which of the following solutions would provide the MOST redundancy and high availability options?

From a disaster recovery perspective, which of the following solutions would provide the MOST redundancy and high availability options?

A.
Data center with a single point of failure

B.
An infrastructure with a cold site

C.
An infrastructure with a hot site

D.
Datacenter with a cache battery backup and cache mirroring option for all servers