1,874,255 rounded to the nearest million

Which graph represents the parent function of y=(x+2)(x-2)

The anwser cause i do not understand just plez

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.