What must additional information on Form I-9 not do?

The correct choice is that additional information on Form I-9 must not obstruct the readability of the form. This is important because the primary purpose of the Form I-9 is to ensure that the information provided by the employer and the employee can be clearly understood and easily reviewed. If the additional information makes the form difficult to read, it can lead to misunderstandings or compliance issues, potentially undermining the verification process.

Maintaining readability is essential for verifying an employee's eligibility to work in the United States. Clear and legible documentation prevents errors and ensures that all parties involved can properly assess the information being presented. Therefore, adding any information that compromises the overall clarity of the form's content would hinder its effectiveness in determining employment eligibility.

The other aspects, while important in their own right, focus on different areas of compliance without addressing the clarity and readability of the document itself.