Given a population of class sizes at a university in an academic year, indicate what the sampling distribution for samples of 30 would consist of. Choose the correct answer below. A. The sampling distribution is the distribution of the results for all possible samples of 30 class sizes. B. The sampling distribution is a representative collection of 30 samples, each containing 30 class sizes, selected with replacement. C. The sampling distribution is the average result from all possible samples of 30 class sizes. D. The sampling distribution is a representative collection of 30 samples, each containing 30 class sizes, selected without replacement.