Which of the following is correct regarding union preelection persuasion? Multiple choice question. Unions are not restricted in the type of preelection persuasion they employ. Unlike employers, unions are restricted in the type of preelection persuasion they employ. Unions must seek the prior approval of the National Labor Relations Board before employing particular preelection persuasion tactics. Unions, like employers, are restricted in the type of preelection persuasion they employ