The graph above shows the total cost of number of fish 1 is $2.50, 2 is $4.50, 5 is $10.50 and 8 is $16.50 is this function or no function?

Which of the following equations is of the parabola whose vertex is at (4, 3), axis of symmetry parallel to the y-axis and focus at (4, -3)? a.) y+3=1/24 (x+4)^2 b.)y-3=-1/24 (x-4)^2 c.)x-4=-1/24 (y-3)^2