Final answer:
The primary purpose of the control mentioned in the question is to ensure greater input accuracy.
Step-by-step explanation:
The answer to the question is 1) Input validation. Input validation is a control mechanism used to ensure the accuracy and integrity of data inputted by users. It involves checking the input data against specified criteria to determine its validity. For example, if a user is required to input their age, the input validation process would check if the entered value is a number within a certain range, such as between 1 and 100. If the input fails the validation rules, an error message is displayed, preventing the user from proceeding until a valid input is provided.