Final answer:
Jakob should add a Text Box control to his report to display the ZIP code from the tblCustomerAddress table, as it is designed for text input and display.
Step-by-step explanation:
To add the ZIP code for customers to the well-designed report from the tblCustomerAddress table, Jakob must add a Text Box control. This type of control is used for displaying or entering text in a report and is the appropriate choice for adding a ZIP code field that requires text input. Unlike a Combo Box, which allows for a selection from a list, a Check Box, which is typically used for boolean input (true/false), or a Radio Button, which allows for one choice within a set of options, a Text Box is the best fit for entering or displaying a single line of text such as a ZIP code.