D is corrent because discovery sampling is a special case of sampling for attributes. In discovery sampling there should be no opportunity to observe more than one occurrence, because it is designed to sample for serious or critical errors. Once a critical or serious error is discovered, the sampling plan will probably be abandoned and a more comprehensive examination undertaken.
A is incorrect because discovery sampling is a statistical sampling approach as contrasted to nonstatistical (judgmental).
B is incorrect because discovery sampling does not use stratification.
C is incorrect because discovery sampling is not a type of variables sampling.
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