Which flexfieids are required to be used by auto invoice to identify transactions and transaction lines, if you load the interface using a customized form?
A. Line-level transaction flexfield, Header-level transaction flexfield, Reference flexfield
B. Line level transaction flexfield, Header level transaction flexfield
C. Line-level transaction flexfield, Invoice transaction flexfield, Reference flexfield, Link to transaction flexfield
D. Line-level transaction flexfield, Header-level transaction flexfield, Link to transaction flexfield
C