A Tube Coagulase Test Was Performed on Catalase-Positive,gram-Positive Cocci That

A tube coagulase test was performed on catalase-positive,gram-positive cocci that were β-hemolytic and grew on mannitol salt agar.The tube was checked after overnight incubation and was negative.Which of the following statements explains this discrepancy?

A) A tube coagulase should not be performed on a catalase-positive organism.
B) A β-hemolytic colony,which is catalase positive and grows on mannitol salt,is normally coagulase negative.
C) The test should have been read in 1 to 4 hours in case any hemolysins are present.
D) No discrepancy is present;the results are accurate.