The target in the X-ray unit is given a:

Explanation

Option A: The target would not be given a zero potential, because there would be no potential difference between the filament and the target, and no X-rays would be produced. Option B: The target in an X-ray tube is given a high negative potential. This is because the target is where the electrons from the filament are accelerated to and produce X-rays when they interact with the atoms of the target material. The higher the potential difference between the filament and the target, the more energy the electrons will have when they hit the target, and the more penetrating the X-rays will be.Option C: The target would not be given a low negative potential, because the electrons would not have enough energy to produce X-rays.Option D: The target would not be given a positive potential, because the electrons would be repelled by the positive potential and would not be able to hit the target.