The quality control department has collected data on defective products produced over a 24-hour time span. Using a random sample of 800 products, they discover that the average number of defects is 254, while the sample standard deviation is 30. The department wants to conduct a test of whether the average number of defective product is 250 or not. Which of the following statements is true? I. The null hypothesis can be rejected with 68% confidence. II. The null hypothesis can be rejected with 95% confidence. III. The null hypothesis can be rejected with 99.7% confidence. A) I only B) II only C) III only D) All three statements

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