Zoe clicks on a Search Network ad offering lipstick, then buys it three days later after clicking on a Facebook ad. When does Google Ads attribute the conversion?

–Zoe clicks on a Search Network ad offering lipstick, then buys it three days later after clicking on a Facebook ad. When does Google Ads attribute the conversion?– –24 hours after purchase, to ensure payment processing– –Never, because the last interaction was with Facebook– —The day she clicked on the ad— –On the day of purchase–