Is the relations a function? {(2, –4), (–2, 4), (2, 5), (5, –1), (–1, 5)} Select the best answer.

a
Yes, the relation is a function
b
No, the relation is not a function. The domain values of –1 and 2 are both assigned to 5.
c
No, the relation is not a function. The domain value of 2 is assigned to both –4 and 5.