<span>Which of these probably could not be used to identify you without additional information?
C. A list of your favorite movies
</span>
This is the characteristic of intangibility
That means that you can't in any way test or see or smell the service but rather you have to rely on the provider's promise that it will be so. That's why it is intangible.
Its main purpose is to restore partial flow of oxygenated blood to the brain and heart. ♥