Advertisers who check web server logs may find their ads received multiple clicks from a single Internet Protocol (IP) address. This could be a result of:

1. Query parsing being used to show geo-targeted ads to users in a different city.
2. Incorrect IP address information filtered from Google Analytics.
3. Internet Service Providers (ISPs) who assign the same IP address to multiple users.
4. Duplicate keywords added to multiple ad groups in one campaign.

Correct Answer:

• Internet Service Providers (ISPs) who assign the same IP address to multiple users.