Which of the following graph is a function?

Which of the following graphs is NOT a function ?

Which of the following is a function whose graph is symmetrical about the origin ?

Which of the following is a function whose graph is symmetrical about the origin ?

Which of the following rational functions could represent the graph shown?

Which one of the following graphs represent a function? (FIGURE)

Which of the following graphs represent function whose derivatives have a maximum in the interval (0,1) ?

Which of the following graphs represent function whose derivatives have a maximum in the interval (0,1) ?