Describes the roadblocking types.
|Only one creative from a line item can serve at a time.
|Any number of creatives from a line item can serve together at a time.
|As many creatives from a line item as can fit on a page will serve. This could mean anywhere from one to all of a line item's creatives given the size constraints of ad slots on a page.
|All or none of the creatives from a line item will serve. This option will only work if served to a GPT tag using SRA (single request architecture mode).
|A master/companion CreativeSet roadblocking type. A LineItem.creativePlaceholders must be set accordingly.