Which of the following subsets of C are open and which are closed?
1) {z : |z|<1}
2) the real axis
3)\(\{z:z^n =1~~for~~some~~integer~~n\geq 1\} \)
4)\(\{z\in \mathbb C: z ~~is~~real~~and~~0\leq z<1\}\)
5) \(\{z\in \mathbb C: z~~is~~real~~and~~0\leq z\leq 1\}\)
Please, help

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