Final answer:
The correct setup for a disaster recovery plan typically involves replicating resources from a private cloud to a public cloud, combining security with cost-effectiveness.
Step-by-step explanation:
To set up a disaster recovery plan, the best practice is often to replicate resources from a private cloud to a public cloud. This approach takes advantage of the scalability and cost-effectiveness of public clouds while keeping the primary data and applications secure in the private cloud. Therefore, the correct answer to the question is b) private, public.