Which option allows an engineer to deploy new firmware to a single phone, while reducing possible impact?

Which option allows an engineer to deploy new firmware to a single phone, while reducing possible impact?
A . Define a new firmware load on specific device. Save configuration and reset individual device.
B . Define load in device defaults. Reset Device Pool.
C . Upload firmware to TFTP server. Restart TFTP service.
D . Enable Peer Firmware Sharing.

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Answer: A