Answer: a) Hot site
Explanation: Hot site is the location that is present in the off-site in which the organization can continue the business process during any disaster. This site provides the organization with all the required equipment and elements to carry on the work at regular basis such as data backups, computer system, communication devices etc.
Other options are incorrect because warm site is used for recovering the business process while major data center goes out of service, cold site takes long time to recover the functioning of the business from off-premises and cloud based site is the site where resources and services are provided to consumer through internet facility.