Final answer:
Jakob should add a Hyperlink control to his report in order to include clickable vendor URLs, making option 3 the correct choice.
Step-by-step explanation:
To add hyperlinks to a report of vendors in a database, the appropriate control to be added to the report is a Hyperlink. Therefore, Jakob should choose option 3) Hyperlink. Hyperlink controls allow for clickable links that can take users directly to the specified URL address. This is different from a Text Box, which is used to display or input text, a Label, which is often used for titles or descriptions without the need for interaction, or a Button, which is used to trigger an event or action when clicked.