Answer:
Only the set of ordered pairs is one-to-one
Explanation:
You have three right
The last one:
A function is one-to-one if and only if, for every value of y there is only one value of x
The mapping diagram is not one-to-one since for two values of x, x = -3 and x = 5 we get the same y value of 6
The set of ordered pairs is a one-to=-one since for every value of y there is a unique value for x