Which of the following relations represent a function? {(1,-,,4)} {(-2,,,1)} {(3,-,,1)} {(4,,,14)}

That means no x repeats with a different y

example
(1,2) and (1,4) would not be a function

but (1,2) and (3,2) is

no firs tnumber repeats

first one, 1 repeats with -3 and 4
2nd one, -2 repeatts with 0 and 1
3rd one, no repeats
4th one, 4 repeats with 12, 13, 14

answer is 3rd one or
{(3,-8),(-2,0),(4,1)}