Which three of the following are some of the methods that F5 uses with its environmental Stress screening chamber? (Choose three.)

A、 Varying the voltage from extreme high to extreme low.
B、 Running a product 300 to 500 times on each cycle
C、 Repairing failed components until they function properly.
D、 Alternate temperature from -5 degrees Celsius to 60 degrees Celsius.
E、 Ensuring continual functioning through fire or flooding conditions.