Two percent of mobile phones produced at a factory are defective. Which of the following is a binomial experiment?

A binomial experiment has a fixed number of trials, and each trial has two outcomes with the same probability of success. In D, exactly 200 phones are selected, and each is classified as defective or not defective; the probability of a defective phone is 0.02 for each selection. A and B continue until a certain outcome occurs, so their number of trials is not fixed. C does not specify a fixed group size.

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