How should data retention be added to the data extension in Email Studio?

A particular data extension need to be configured to store six months of data.

How should data retention be added to the data extension in Email Studio?
A . Run a query to overwrite the rows with six months of data
B. Import a file to overwrite the rows with six months of data
C. Create a new data extension that includes data retention settings
D. Update the data extension configuration to include data retention settings.

Answer: C