Which of the following does NOT describe the relationship between any function, f (x), and its corresponding inverse function f-1 (x)?

A. The graph of f(x) and f-1(x) are symmetrical about the line y=x.

B. The domain and range of the function, f(x), are reversed in the inverse of the function, f-1(x).

C. The inverse of a function, f-1(x), contains all the same points as the original function, f(x).

D. The inverse of a function, f-1(x), is not always a function itself.