Which printer holds a "Guinness Book of World Records" certification as the fastest desktop color printer in the world?

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Which printer holds a "Guinness Book of World Records" certification as the fastest desktop color printer in the world?
A . IBM 4230-4S3 Dot Matrix printer
B. HP OfficeJet Pro X551 color printer
C. HP Color LaserJet M4555 MFP
D. Xerox Phaser 3635MFP/S

Answer: B