I don't know this please help

Pick the description of a geometric object that best matches the real world object box for a deck of card

With this one. will mark brainliest

Which of the following best describes the graph below? + + 2 + 3 + 4 1 o a. it is not a function. o b. it is a one-to-one function. o c. it is a many-to-one function. o d. it is a function, but it is not one-to-one.