An advertisement states: 'Our new phone has a battery that lasts up to 48 hours.' What is the most accurate interpretation of 'up to 48 hours'?
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A
The battery always lasts exactly 48 hours
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B
The battery lasts a minimum of 48 hours
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C
The battery can last as long as 48 hours but may last less
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D
The battery lasts 48 hours only when fully charged at 100%