A function t_circle * create_circle(int a, int b, int r) dynamically allocates memory to store a t_circle. It allocates and initializes its center field with the call to the function create_point(a, b). It also initializes its radius field with the value r.

We then consider the following statement:

t_circle * c = create_circle(1, 2, 3);

Among the following statements, which one allows us to free all the memory allocated by create_circle?