Final answer:
A control plan that defines acceptable data formats is known as preformatted screens. These ensure data entry consistency and error prevention. The choice between a written document and other mediums depends on context and audience.
Step-by-step explanation:
The control plan that defines the acceptable format of each data field in order to control the entry of data is c. preformatted screens. These screens are designed with specific areas where data can be entered, and they often include formatting rules to ensure that the data entered fits a predetermined format. For instance, a preformatted screen might allow only numerical input in a date field or enforce the input to match a specific pattern, such as 'MM/DD/YYYY' for dates. This form of control is essential in data entry processes to avoid errors and ensure consistency in the information being captured. Choosing whether to prepare a traditional written document or use another medium, such as a slide deck or video presentation, will depend on the context of the information to be communicated and the audience's needs; a written document would be more appropriate for detailed, permanent records, whereas a slide deck or video might be better for presentations or visual learners.