【单选题】
A Toxicogenic Vibrio cholerae (O1 and O139) with less than 1 colony forming unit (CFU) per 100 milliliters
B less than 10 CFU per 1 gram (wet weight) zooplankton samples
C Escherichia coli less than 250 CFU per 100 milliliters
D Intestinal Enterococci less than 100 CFU per 100 milliliters
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