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Determine whether the relation is a function.

(0, 1) (5, 6) (7, 9) (8, 9)

A. Not a function, there is not a unique y-value for each x-value

B. Not a function, there is not a unique x-value for each y-value

C. Function, there is a unique x-value for each y-value

D. Function, there is a unique y-value for each x-value