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If you are a sole proprietor, then you do not need WC. You have no employees.
The rule for WC is that you have to be an employer, with even one employee, and then you'd have to obtain the coverage.
That being said, even with a sole proprietorship, you can elect the coverage.
The state may require that you send in a waiver of WC rights, so that it is clear that you are claiming sole proprietorship.