If f = {(4, 2), (6, 1), (8, 4), (10, 2), (12, 5)}, what is the range? {1, 2, 4, 5} all whole numbers {2, 1, 4, 2, 5} {4, 6, 8, 10, 12}

Given the function:
f = {(4, 2), (6, 1), (8, 4), (10, 2), (12, 5)}
the range is all the y-values, it's not to be confuse with the domain which is all the x-values, thus the range of our function will therefore be the following set.
{2,1,4,2,5}

{2,1,4,2,5}