Which feature guarantees that a virtual machine can power up at another data center in the event of a disaster?

The feature that ensures a virtual machine can power up at another data center in the event of a disaster is vSphere Replication. This feature allows for asynchronous replication of virtual machines to a secondary site, ensuring that up-to-date copies of the virtual machine's data are maintained at a remote location. In the event of a disaster at the primary site, vSphere Replication enables the recovery of the virtual machine by powering it up at the secondary site.

This capability is crucial for disaster recovery planning, as it not only replicates data but also supports the recovery process, allowing for quick restoration of services without significant data loss. With vSphere Replication, administrators can create recovery plans that specify how and when VMs should be recovered, making it a fundamental part of a robust disaster recovery strategy.