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A student was performing the Kinyoun's acid fast staining method on a sample of bacteria. The resulting stained slide contained only cells that appeared blue when visualized using a microscope. Which of the following statements is most likely true?
1) The bacteria in the sample were acid-fast positive
2) The bacteria in the sample were acid-fast negative
3) The bacteria in the sample were Gram-positive
4) The bacteria in the sample were Gram-negative