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 248, while the sample standard deviation is 35. 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 a confidence level of 60% or above. II. The null hypothesis can be rejected with a confidence level of 97.5% or above. A) I only B) II only C) Both I and II D) Neither I nor II

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