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d. different country. same country/campus is not recommended in case of wars or natural disasters.
Quick answer for having the DR in the same campus is Not recommended.
Reason : if a disaster occurs, there is a good chance that the whole area may be not functioning properly.
Answer to this question depends on the Services you want to keep in the DR site and the state of your Country to host a DR site (Natural Disasters). Also if there are any legal obligations in hosting outside the country and retrieving data from there.
If all these conditions are satisfied, you can consider going for the DR site outside the country depending on the cost factor.
If your Country has a large geographical area, then you can consider DR site in a different state.