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Which of the following meets the criteria for just noticeable difference of an auditory stimulus? a.
When 100 people were exposed to a pair of subtly distinct tones, 50 people noticed a difference between them.
b. When 50 people were exposed to a pair of subtly distinct tones, all 50 people noticed a difference between them.
O O
Oc.
When a group was exposed to a pair of subtly distinct tones 50 times, one person noticed a difference between them 25 times.
d. When a group was exposed to 50 pairs of subtly distinct tones, one person noticed a difference between them each time.

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