E-Verify is described as:

• A. A voluntary program to confirm eligibility; mandatory for contracted federal workers and vendors.
• B. A mandatory background check for all employees.
• C. A state-issued social security verification program.
• D. A private sector payroll system.

Answer: (A)

E-Verify is a government-run online system that lets employers confirm that a new hire is legally allowed to work in the United States. It started as a voluntary tool for most employers, but participation is mandatory for federal government contractors and the subcontractors they hire. So describing it as generally voluntary and mandatory for contracted federal workers and their vendors matches how it’s used in practice. It’s not a universal mandatory background check for all employees, it isn’t a state-issued social security verification program, and it isn’t a private sector payroll system. Instead, it compares the hire’s information against DHS and SSA records to verify work authorization.