Final answer:
The statement is true; both control solutions and test strips need to be marked with the open and expiration date once they are opened to ensure accuracy and safety.
Step-by-step explanation:
The statement that once opened, control solutions and test strips must be dated with open and expiration date is true. It is important to ensure that these products are effective and safe to use. Writing the open date helps to keep track of the product's shelf life, while the expiration date is crucial to know when the product should no longer be used. This is especially important for items like glucose test strips and control solutions, which can give inaccurate results if used past their expiration dates or if they have been open for too long and have been exposed to environmental factors that can affect their functionality.