Rina has heard the term Quality Score mentioned before and is interested to learn what it actually is. Which statement describes Quality Score?

It’s a metric that scores the quality of traffic that clicks on your ads
It’s an estimate of the quality of your ads, keywords, and landing pages.
It’s a final score that’s based on every element of the structure of your account.
It’s feedback left by users who’ve clicked on your ad and browsed your website.