What step should be taken to assign an advertiser to a preferred deal when creating a new inventory source?

Q: What step should be taken to assign an advertiser to a preferred deal when creating a new inventory source?

(A) Add the advertiser’s name to the inventory access field (B) Ask the publisher to activate the deal in Display & Video 360’s insertion order (C) Check that the advertiser has been automatically added to the line item’s deal (D) Assign the advertiser using a Google form

(A) Add the advertiser’s name to the inventory access field
(B) Ask the publisher to activate the deal in Display & Video 360’s insertion order
(C) Check that the advertiser has been automatically added to the line item’s deal
(D) Assign the advertiser using a Google form