Which document outlines the specifics of employment verification?

The I-9 form is the document that specifically outlines the requirements for employment verification in the United States. It is used to verify an individual's identity and eligibility to work. The form requires the employee to provide specified documentation that proves their identity and legal authorization to work in the country, such as a passport or a driver's license combined with a social security card.

In contrast, the W-4 form is related to tax withholding and does not address employment verification. The Employment Agreement details the terms of employment, including job responsibilities, salary, and benefits, rather than verifying eligibility to work. Similarly, the Job Offer letter serves to formally communicate an offer of employment, including the position and terms, but it does not fulfill the legal requirement for verifying employment eligibility. Thus, the I-9 form is the correct choice for employment verification specifics.