A large multinational corporation maintains a complex network of data centers across the world.

The correct answer is B — A fully equipped hot site with up-to-date hardware and software.

As stated in WGU Cybersecurity Architecture and Engineering (KFO1 / D488), a hot site is a fully operational data center that mirrors the organization's primary systems and data. In the event of a disaster, operations can quickly transfer to the hot site with minimal downtime, ensuring business continuity.

Mobile data centers (A) are not standard disaster recovery solutions for multinational corporations. Basic secondary backup sites (C) (cold sites) require setup time and are slower to activate. Cloud backups (D) protect data but do not instantly restore full operational capabilities like a hot site.

Reference Extract from Study Guide:

"Hot sites maintain fully operational systems, applications, and data, allowing organizations to maintain business continuity with minimal disruption in the event of a disaster."

— WGU Cybersecurity Architecture and Engineering (KFO1 / D488), Disaster Recovery and Business Continuity Planning