Which table shows a function whose range has exactly three elements?

Question

x |f(x)
1 | 4
2 | 4
3 | 4

///////

x |f(x)
3 | 8
4 | 6
5 | 12
6 | 8

///////

x |f(x)
0 | 5
2 | 9
0 | 15

///////

x |f(x)
1 | 4
3 | 2
5 | 1
3 | 4

Is the answer C? I was also thinking A since the f(x) values are 4, but the regular x values are different, thereby not contradicting it to be a function.

Answer 1

poor wording, you must have meant
three "different" values.

Answer 2

I think option A is the best one, but the assessment says that B is correct. However, the lesson states that you can as long as each element(x) is different, you can have the same y value in the second column.

Answer 3

In a function, the same x value cannot have 2 or more different y values

This happens in C and D, so those two are NOT functions

That leaves A and B, but A led me to the objection I first stated.

Answer 4

The answer is 54 to my own understanding