Of the available options, which is a purpose of the field source in data templates?

[answerhappygod]

Of the available options, which is a purpose of the field source in data templates?

A. The field source is a field property that designates where in the content tree the field obtains its data.
B. The field source is used to control a user’s access and permissions to folders and files in the content tree.
C. The field source defines how a field’s data appears in the Content Editor in the UI.
D. A field source maps a field to the underlying class representation in the API.