Final answer:
A control linked to a field in a report's record source is known as a 'bound control'. The specific type (Text, Combo Box, Check Box, List Box) doesn't determine whether it's bound; it's the connection to a data source field that does.
Step-by-step explanation:
A control whose source of data is a field in the report's record source is a(n) bound control. In the context of forms and reports in database applications such as Microsoft Access, a bound control is directly connected to a field in a table or query and displays, enters, and updates data in that field. None of the options provided (Text, Combo Box, Check Box, List Box) explicitly defines the nature of the control in terms of data binding.
However, all these controls can potentially be bound controls if they are connected to a field in a record source. Therefore, the answer does not correspond exactly to any of the options given, but the concept of a 'bound control' is what encompasses the idea of a control linked to a data source field.