Which of the following relations is a function? Select all that apply.
A{(1,3),(2,4),(3,5),(4,6),(5,7)}
B{(3,1),(4,1),(5,1),(6,1),(7,1)}
C{(1,0),(1,2),(3,2),(5,4),(7,6)}
D {(-5,4),(-3,2),(-1,0),(-3,-2).(-5,-4)

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