Does 'Additionally, GAO's FederalInformationSystemControlsAuditManualis now used by most major federal audit entities to evaluate computerrelated controls.' logically negate the premise 'A few major federal audit entities use the GAO system.'
Additionally, GAO's FederalInformationSystemControlsAuditManualis now used by most major federal audit entities to evaluate computerrelated controls.###A few major federal audit entities use the GAO system.