Antonio has a line-item that is under-delivering.Which of the following manual optimization tactics should he consider?(Select2)

When a line item is under-delivering, the goal is to increase impression opportunities. Selecting any unchecked supply sources expands the available inventory, allowing the line item to bid on more impressions and thus increase delivery. Similarly, relaxing the viewability setting means the line item will bid on a broader range of inventory, including impressions that might have slightly lower viewability but are still valuable, thereby increasing delivery. Decreasing bids would further reduce delivery, as the line item would be less competitive in auctions.