What are the correct descriptions of the operations that should be performed before the communication device is powered up? (Multiple choice)

What are the correct descriptions of the operations that should be performed before the communication device is powered up? (Multiple choice)
A . Measure the power supply circuit without short circuit between each other and the ground
B . Check the electrical connection is firm and reliable
C . The output switch of the power supply device is disconnected and the output voltage is normal.
D . Rated output current meets the requirements of powered devices
E . All power switches of the powered device are disconnected
F . Measuring no short circuit inside the powered device

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Answer: ABCDEF