An ad has three sitelinks. A user clicks on the main link and a couple sitelinks. How many clicks will the advertiser pay for, and how will their prices vary?

The user will pay for one click only regardless of how many sitelinks the user clicked on.
The advertiser will pay for each click separately. Click price for sitelinks is 0.30 EUR lower than for regular links.
The advertiser will pay for each click separately. Click price for sitelinks is 0.30 EUR higher than for regular links. The advertiser will pay for each click separately. The click price is the same for all links.