When using a cloud-based file-synchronization service (such as OneDrive, Dropbox, or Google Drive), which of the following conditions must be met for edits made to a document on one device to be reflected on a second device immediately?
Both devices must have an active Internet connection so the service can synchronize through the provider's servers.
The devices must be connected to the same Bluetooth personal-area network (PAN); an Internet connection is optional.
Only the device where the edit is made requires Internet access; the other device will update automatically even if offline.
Both devices only need to be powered on; no network connection is required once the service is configured.
Cloud-based file-synchronization clients cache edits made while offline but cannot propagate those changes to other devices until they can reach the provider's servers. Therefore, both devices need active Internet connectivity for real-time synchronization. Local power state, Bluetooth connectivity, or one-sided connectivity alone will not allow the second device to receive the update until it, too, is online.
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