The difference between X-rays and \(\mathrm{y}\)-rays is that ____________

A. X-rays arise from energy changes and are due to electrons while \(Y\)-rays come from the nucleus  
B. X-rays are electromagnetic radiations while \(Y\)-rays are not
C. X-rays have higher frequencies than \(\mathrm{y}\)-rays
D. X-rays are more penetrating than \(\mathrm{Y}\)-rays

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Correct Answer: A