How can the pacing metrics help you to optimize remarketing line items?

Pacing metrics provide insights into how quickly your budget is being spent. For remarketing line items, this is crucial because it helps identify if your bids are too low, causing you to underspend and miss potential impressions, or if your budget is too restrictive for the available inventory and audience size. By monitoring pacing, you can adjust bids and budgets to ensure you're maximizing your reach to valuable remarketing audiences without leaving money on the table. The other options are less direct or inaccurate: pacing doesn't directly show what inventory more spend might have acquired (that's more about reach and bid landscape), nor does it dictate future pacing settings (it informs adjustments). While frequency settings can impact impression loss, pacing metrics primarily highlight budget and bid constraints, not directly frequency-related impression loss.