Which statement is true regarding a data transformation process that uses a Column Map during an Insert/Load process?

A.
Column Maps can not be used during Insert/Load, only during Convert.

B.
No changes are made to the extract file, only to the rows as they are written to the database.

C.
The original extract file remains unchanged, and a modified copy of the extract file is made with the Column Map specifications applied.

D.
The original extract file is modified with the Column Map specifications.