Final answer:
Text box controls on a form are true to display data from an underlying record source, allowing users to view or edit data in a database.
Step-by-step explanation:
True, on a form, text box controls are designed to display data from an underlying record source. In database management systems like Microsoft Access, forms serve as a user interface where users can input, edit, or view stored data. Each text box within the form is typically bound to a field in the database's table or query, showing the data for that particular field. When a user navigates through records in the form, the text boxes reflect the content of the corresponding fields in the active record.