¿Cuales de las siguientes expresiones representan una función, explicar por favor?

a. {(1,1) , (2,2) (3,3) , (4,4), (5,5)}

b. {(1,1), (1,-1), (4,2), (4,-2), (9,3), (9,-3)

c. {(3,6) , (2,4), (7,14), (-3,6)}

d. {(1/2,1/4), (1/3,1/9),(2/5,4/25) (2/5,4/36)

Ayúdenme por favor.

Gracias.

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