Final answer:
Key verification is the control plan designed to achieve the goal of input accuracy.
Step-by-step explanation:
The control plan designed to achieve the goal of input accuracy is key verification.
In key verification, data is entered twice by two different individuals. The system then compares the two entries and identifies any discrepancies. This method helps to reduce data entry errors and ensures the accuracy of the input.
Other control plans mentioned, such as confirm input acceptance, batch sequence check, and cumulative sequence check, are not specifically focused on achieving input accuracy but rather on other aspects of data processing and validation.