The difference between X-rays and gamma rays is that?

A. x-rays are more penetrating than gamma rays
B. x-rays are electromagnetic radiations while gamma rays are negatively charged radiation
C. x-rays have higher frequencies than gamma rays
D. x-rays arise from energy changes in the electronic structure of atoms while gamma rays come from the nucleus

Correct Answer:

Option D = x-rays arise from energy changes in the electronic structure of atoms while gamma rays come from the nucleus