正解:C
A warm site is a backup site that has some of the necessary hardware, software, and network resources to resume operations, but not all of them. A warm site requires some time and effort to become fully operational.
A warm site is different from a cold site, which has minimal or no resources, and a hot site, which has all the resources and is ready to take over immediately.
References: CompTIA Server+ Study Guide, Chapter 10: Disaster Recovery, page 403.