Which sentence uses commas correctly?
A hummingbird can fly right left up down backwards and, even upside down.
A hummingbird can fly, right, left, up, down, backwards, and even, upside down.
A hummingbird can fly right, left, up, down, backwards, and even upside down.
A hummingbird can fly right, left, up, down, backwards and, even upside down.