Which of the following is the equation for the graph shown?
graph of an ellipse on a coordinate plane going through approximately 0 comma 6, 0 comma negative 6, 4 and one half comma 0 and negative 4 and one half comma 0 with points inside ellipse at 0 comma negative 4 and 0 comma 4, and lines y equals 9 and y equals negative 9
x squared over 20 plus y squared over 36 equals 1
x squared over 36 plus y squared over 20 equals 1
x squared over 20 minus y squared over 36 equals 1
x squared over 36 minus y squared over 20 equals 1