According to a certain estimate, the depth N(t), in centimeters, of the water in a certain tank at t hours past 2:00 in the morning is given by $${N}({t})=-{20}({t}-{5})^{2}+{500}$$ for $$0 \leq t \leq 10$$. According to this estimate, at what time in the morning does the depth of the water in the tank reach its maximum?
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A5:30
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B7:00
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C7:30
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D8:00
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E9:00