How can one identify advertisements in internet search results?

To identify advertisements in internet search results, look for labels such as "Ad" or "Sponsored" that are typically displayed before or next to the search result link. These labels indicate that the result is a paid placement rather than an organic search result.

The correct option is Ad /Sponsored written before the search result.

The final answer is $\boxed{\text{Ad /Sponsored written before the search result}}$.