in rewarded ad which code means user closed the ad by itself

in these codes which one means user closed ad by himself or herself // Called when an ad request has successfully loaded. this.rewardedAd.OnAdLoaded += HandleRewardedAdLoaded; // Called when an ad request failed to load. this.rewardedAd.OnAdFailedToLoad += HandleRewardedAdFailedToLoad; // Called when an ad is shown. this.rewardedAd.OnAdOpening += HandleRewardedAdOpening; // Called when an ad request failed to show. this.rewardedAd.OnAdFailedToShow += HandleRewardedAdFailedToShow; // Called when the user should be rewarded for interacting with the ad. this.rewardedAd.OnUserEarnedReward += HandleUserEarnedReward; // Called when the ad is closed. this.rewardedAd.OnAdClosed += HandleRewardedAdClosed;