Which of the following statements related to the generation of x-rays by a Tungsten cathode and anode encased in a Pyrex glass vacuum tube is correct?
A. The cathode filament is used to generate electrons via thermionic emission and the anode is used as the target for the accelerated electrons.
B. A step-up and a step-down transformer is used to transform the regular 110V alternating current to a high voltage at the level of the tube (more than 50 kV), and to a low voltage at the level of the filament (10 V), respectively.
C. A focusing cup houses the cathode to prevent the electrons from repelling each other away from the ligament and allow the stream of electrons from cathode to anode to be controlled.
D. All of the above.