A stock trading company had the budget for enhancing its secondary datacenter approved. Since the main site is a hurricane-affected area and the disaster recovery site is 100 mi (161 km) away, the company wants to ensure its business is always operational with the least amount of man hours needed. Which of the following types of disaster recovery sites should the company implement?

• A. Hot site
• B. Warm site
• C. Cold site
• D. Cloud-based site

some say b, others say a. Please explain. If you don't know, please don't answer.