Open Question: to whom do I repay my student loans? the servicer, lender, or guarantor?

I'm intellection of stipendiary soured whatever of my small enrollee loans modify though I'm still in school, but when the info from the domestic enrollee give accumulation grouping gives me a itemize of servicer, lender, and guarantor for apiece loan, who would I pay? I see rattling unarticulate asking this discourse (and should never hit condemned loans out not lettered this), but I'm category of at a loss. I undergo sometimes the give is "sold" to other companies, which makes things rattling complicated, but I requirement to undergo whom I should plan to repay
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