Which setting do you have to make to achieve this?

A header partner function is to be used and changed on the item level.

Which setting do you have to make to achieve this? Please choose the correct answer.
A . Include the partner function in the partner determination procedure of the item category
B . Select the ‘Copy partner function’ parameter in the Customizing settings for the item category
C . Maintain the sales document header as the relevant source for the partner function
D . Mark the partner function as unique in the partner determination procedure of the sales document type

Answer: A