Select all the relations which are not functions.
{(x, y) | x is the suggested retail price of particular car and y is price paid by a random car buyer for that car}
{(x, y) i x is a randomly selected person from the population who is a parent and y is a child of
that person}
{(x, y) | x is a randomly selected kentucky driver's license number and y is the identity of the person with that license number}
{(x, y) | x is a day of the year and y is a person born on that day}
{(x, y) is a randomly selected natural number greater than 8 and y is the remainder when that number is divided by 8}