Write an equation for a function that has a graph with the shape of y=x², but upside-down and shifted right 5 units and up 6 units. Which of the following options correctly represents the equation of the function?

A) f(x) = -(x-5)² + 6
B) f(x) = -(x+5)² + 6
C) f(x) = (x-5)² + 6
D) f(x) = (x+5)² + 6