Which of the following professional(s) are more likely to run the risk of a permanent change in their cell’s DNA? I. Researchers using carbon-14 isotope II. X-ray technician III. Coal miner IV. Dyer and painter Select the correct answer using the codes given below:

1. (a)II alone
2. (b)I, II and III
3. (c)I, II and IV
4. (d)I, III and IV