Regarding Representation Election Procedures,which of the Following Statements Is/are True

Regarding representation election procedures,which of the following statements is/are true?

A) at least 50% of the employees in a bargaining unit must sign authorization cards
B) an employer may recognize a union only if at least 50% of the employees in a bargaining unit have signed authorization cards
C) if an election is ordered, the employer must provide to the union names and addresses of employees within 7 days
D) the time between when an election is ordered and when it takes place is the time of least scrutiny of the activities of the employer and the union