How can a Consultant migrate the file attachments?

Universal Containers is migrating from Classic Knowledge to Lightning Knowledge using the Lightning Knowledge Migration Tool and noticed that none of the Article file attachments were migrated.

How can a Consultant migrate the file attachments?
A . Upload the files as Documents, then relate them to the migrated Articles.
B. Use the Lightning Knowledge Migration Tool and choose ‘include files’.
C. Use the Files Related List on each article to add files to your articles.
D. Post the Files to the Chatter Feed on each Article.

Answer: C