In which among the following categories, Radon (Rn) can be placed?

In which among the following categories, Radon (Rn) can be placed?
1. Radioactive Element
2. Inert Gas
3. Noble Gas
Choose the correct option:
[A]Only 1
[B]1 & 2
[C]2 & 3
[D]1, 2 & 3
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