Answer: Top right and top left.
Step-by-step explanation:
For a function to be invertible, we must have that the function is one to one, this is because if we have that the function f(x1) = Y = f(x2)
for the inverse, such that g(f(x1)) = x1
but we know that f(x1) = f(x2)
this means that g(f(x1)) = x2
so g(y) is not a function.
Then, the only functions that can be invertible are the one-to-one functions, the top right, and the top left functions.
