Payroll service giant, initially, Big name in payroll

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Possible Answers: ADP.

Random information on the term “ADP”:

Automatic Data Processing, Inc. (ADP), is an American provider of business outsourcing solutions. It is also a provider of computing services to automobile and heavy equipment dealers. ADP is one of four U.S. companies to get a AAA credit rating from Standard & Poor’s (S&P) and Moody’s.[2][3]
Taken from Wikipedia