Which way is up?

Any direction away from the Earth's center Away from from Earth's center. In other Words all directions.

This answer is wrong. The question is, in absolute terms, not relatively speaking, Which way is up?

If up is any direction away from the Earth's center, that would mean that , as admitted in the incorrect answer, up would be 360 times 360 different directions.

The correct answer is man has no idea what direction is up. Up cannot be 129,600 different directions which include directions which would be opposite to other directions.

The answer is man does not know which way is up.