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Question
A WATS arrangement
Options:
A .  None of these
B .  is less expensive than flat-rate service only when the number of calls is small and the duration of each is long
C .  is always less expensive than flat-rate service
D .  is never less expensive than flat-rate service
E .  is less expensive than flat-rate service only when the number of calls is large and the duration of each is short
Answer: Option E

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