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 prohibits employees from talking about unions during working hours. 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 enforces rules that limit employees from distributing materials during their "working time" or in "working areas