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Hi again ... You'll use form 8832 to request a change in tax treatment.
An LLC isn't a C-Corp by default, however. If you don't elect C-Corp or S-Corp taxation, the LLC is either treated as a disregarded entity (sole proprietorship) if only one member (owner in LLC terminology) or as a partnership if there is more than one owner.
See this: https://www.irs.gov/pub/irs-pdf/f8832.pdf