Which three statements about powering down a Cisco UCS C-Series Rack-Mount Server to perform maintenance or replacement

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Which three statements about powering down a Cisco UCS C-Series Rack-Mount Server to perform maintenance or replacement are true? (Choose three.)

A. Standby power mode: Power is supplied only to the service processor and the cooling fans, and it is safe to power off the server from this mode.
B. Power status LED. Green indicates that the server is in main power mode and can be safely powered off.
C. Graceful shutdown: Press and release the power button. The operating system performs a graceful shutdown, and the server goes to standby mode, which is indicated by an amber power status LED.
D. Disconnect the power cords from the power supplies in your server to completely power off the server.
E. Only an emergency shutdown can be performed using the power button on the server front panel.
F. The Cisco UCS C-Series Rack-Mount Server has only one power mode.