An icicle drips at a rate that can be represented by the function f (x) = - x2 + 8x - 7, where 0 ≤ x ≤ 10 and x is the number of hours after the sun has risen. When f (x) is a negative number, the icicle is not dripping. Determine the values when the icicle starts and stops dripping.
A) x = - 1 and x = 7
B) x = 1 and x = 7
C) x = 1 and x = - 7
D) x = - 1 and x = - 7
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