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Question :-

Which procedure will disable a known Open Firmware password?
Turn off the computer, disconnect the power cable, and remove the PMU battery for 24 hours.
Start up in Open Firmware, enter the current Open Firmware password at the prompt, then type "reset-all", and restart the computer.
Start up in Open Firmware, enter the current Open Firmware password at the prompt, then type "set security off", and type "reset-all" to restart the computer.
Start up in Open Firmware, type "setenv security-mode none", enter the current Open Firmware password at the prompt, then type "reset-all" to restart the computer.

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