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Need some help answering questions about the Nuclear Regulatory Commission?

Hi, I need to know a few things about the NRC that I am not able to locate one the net, thanks for the help in advance.

one is, Is the NRC an Independent executive agency, a regulatory commission, or a government corporation and explain why.

second is, Is the NRC a line agency or a staff agency and explain why, using an example of what the NRC does.

Thanks for the help!