One of Three Quality-Control Results for an Instrument Violates the 1₂s

One of three quality-control results for an instrument violates the 1₂s rule.What is the proper course of action?

A) Continue to run samples but mark the results as "pending QC approval."
B) Use a back-up instrument for running patient specimens until resolution of the problem.
C) Refrain from running patient specimens until resolution of the problem.
D) Because the 1₂s rule is only a warning, continue running patient specimens.