Which of the Following Statements About a Union Organizing Campaign

Which of the following statements about a union organizing campaign and application for certification is correct:

A) All contacts with employees are made away from the workplace.
B) The union will try to keep the organizing campaign secret as long as possible in some situations.
C) The union must give all employees an opportunity to join.
D) All the work is done by paid national or international union representatives.
E) Employers are given an opportunity to respond to any claims made by the union before the labour relations board processes an application for certification.