A certain list of 100 data has an average (arithmetic mean) of 6 and a standard deviation of d, where d is positive. Which of the following pairs of data, when added to the list, must result in a list of 102 data with standard deviation less than d ?
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A -6 and 0
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B 0 and 0
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C 0 and 6
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D0 and 12
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E6 and 6