What happens when you set a field as shared? And unversioned?

What happens when you set a field as shared? And unversioned?
A . A shared field contains a different version of the data for all versions in all languages. An unversioned field contains different version of the data per language.
B. Both
C. A shared field contains a single version of the data for all versions in all languages. An unversioned field contains one version of the data per language.
D. None

Answer: C