The correct answer to the question is option 4: X-rays are not deflected by an electric field or a magnetic field.

X-rays are a type of electromagnetic radiation, which includes both electric and magnetic fields oscillating together. However, unlike other types of electromagnetic radiation such as visible light or radio waves, X-rays have a much higher frequency and energy.

When X-rays interact with matter, they can be absorbed, scattered, or transmitted. However, they are not deflected by electric or magnetic fields. This is because the deflection of charged particles by electric or magnetic fields depends on their charge and mass. Since X-rays are made up of photons, which are neutral particles with no charge, they do not experience any deflection when passing through an electric or magnetic field.

Therefore, X-rays pass through these fields unaffected, allowing them to be used in various applications such as medical imaging, security scanning, and materials analysis.

In conclusion, X-rays are not deflected by either an electric field or a magnetic field due to their neutral charge and photon nature.