Choose THREE] ULP of Employers An employer transfers an employee who filed a charge with the National Labor Relations Board or gave testimony before the National Labor Relations Board. An employer enforces rules that limit employees from distributing materials during their "working time" or in "working areas." An employer implies a promise of benefits by soliciting employee grievances during a union organizing campaign. An employer polls employees to determine the extent of their support for a union. An employer prohibits employees from talking about unions during working hours